Basic Business Statistics, Student Value Edition
14th Edition
ISBN: 9780134685113
Author: Mark L. Berenson, David M. Levine, David F. Stephan, Kathryn Szabat
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 21PS
Is there a difference in the yields of different types of investments? The file CDRate contains the yields for a one-year certificate of deposit (CD) and a five-year CD for 39 banks listed by West palm Beach, Florida on January 9, 2017.
a. Construct a
b. Construct a
c. Compare the results of (a) and (b).
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Is there a difference in the yields of different types of investments? The accompanying data provide yields for a one-year certificate of deposit (CD) and a five-year CD for 25 banks. Complete parts a through c below.
a. Construct a 90% confidence interval estimate for the mean yield of one-year CDs.
A survey asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-time employees at your company over the next 12 months?" In the current survey, 220 of 400 executives answered Yes, while in a previous year survey, 176 of 400 executives had answered Yes. Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time. (Use current year − previous year. Round your answer to four decimal places.)
to
A survey asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-
time employees at your company over the next 12 months?" In the current survey, 232 of 400 executives answered Yes, while in a previous year survey, 184 of 400 executives had answered Yes.
Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time. (Use current year previous year. Round your answer to four decimal places.)
to
What is your interpretation of the interval estimate?
The 95% confidence interval ---Select---
✓zero. This suggests that the proportion of executives who are predicting an increase in full-time jobs for the current year is ---Select---] than the
proportion of executives who were predicting an increase in full-time jobs for the previous year.
Chapter 8 Solutions
Basic Business Statistics, Student Value Edition
Ch. 8 - If X=85, =8,andn=64, construct a 95 confidence...Ch. 8 - If X=125,=24,andn=36, construct a 99 confidence...Ch. 8 - Why is it not possible in Example 8.1 on page 280...Ch. 8 - Is it true in Example 8.1 on page 280 that you do...Ch. 8 - A market researcher selects a simple random sample...Ch. 8 - Suppose that you are going to collect a set of...Ch. 8 - Consider the confidence interval estimate...Ch. 8 - You are working as an assistant to the dean of...Ch. 8 - A bottled water distributor wants to estimate the...Ch. 8 - The operations manager at a light emitting diode...
Ch. 8 - If X=75,S=24,andn=36, and assuming that the...Ch. 8 - Determine the critical value of t in each of the...Ch. 8 - Assuming that the populations is normally...Ch. 8 - Assuming that the population is normally...Ch. 8 - A marketing researcher wants to estimate the mean...Ch. 8 - A survey of nonprofit organizations showed that...Ch. 8 - The U.S. Department of Transportation requires...Ch. 8 - The file FastFood contains the amount that a...Ch. 8 - The file AirportRating contains the rating of...Ch. 8 - The annual NFL Super Bowl is the most widely...Ch. 8 - Is there a difference in the yields of different...Ch. 8 - One of the major measures of the quality of...Ch. 8 - A manufacturing company produces electric...Ch. 8 - The file MobileCommerce contains mobile commerce...Ch. 8 - One operation of a mill is cut pieces of steel...Ch. 8 - Ifn=200andX=50, Construct a 95 confidence interval...Ch. 8 - ifn=400andX=25, Construct a 99 confidence interval...Ch. 8 - A cellphone provider has the business objective of...Ch. 8 - In a survey of 1,003 adults concerning complaints...Ch. 8 - What do you value most when shopping in a retail...Ch. 8 - In a survey of 823 human resource professionals...Ch. 8 - A Pew Research Center survey of 4,787 adults found...Ch. 8 - What business, economic, policy and environmental...Ch. 8 - If you want to be 95 confident of estimating the...Ch. 8 - If you want to be 99 confident of estimating of...Ch. 8 - If you want to be 99 confident of estimating the...Ch. 8 - If you want to be 95 confident of estimating the...Ch. 8 - A survey is planned to determine the mean annual...Ch. 8 - If the manager of a bottled water distributor...Ch. 8 - If a light bulb manufacturing company wants to...Ch. 8 - If the inspection division of a county weights and...Ch. 8 - An advertising media analyst wants to estimate the...Ch. 8 - An advertising media analyst wants to estimate the...Ch. 8 - A growing niche in the restaurant business is...Ch. 8 - What does brand loyalty mean to consumers?...Ch. 8 - A Federal Reserve Bank of Atlanta report looks at...Ch. 8 - In a study of 443 nonprofits nationwide, 130...Ch. 8 - Cybersecurity is a critical business issue that...Ch. 8 - Personal data is the new currency of the digital...Ch. 8 - Why can you never really have 100 confidence of...Ch. 8 - When should you use the t distribution to develop...Ch. 8 - Why is it true that for a given sample size, n an...Ch. 8 - Why is the sample size needed to determine the...Ch. 8 - GlobalWablndex study noted the percentage of...Ch. 8 - How do smartphone owners use their smartphones...Ch. 8 - A market researcher for a consumer electronics...Ch. 8 - An information technology (IT) provider of cloud...Ch. 8 - The human resource (HR) director of a large...Ch. 8 - A national association devoted to HR and workplace...Ch. 8 - The financial impact of IT system downtime is a...Ch. 8 - The branch manager of an outlet (Store 1) of a...Ch. 8 - Scarlett and Heather, the owners of an upscale...Ch. 8 - The manufacturer of Ice Melt claims that its...Ch. 8 - Claims fraud (illegitimate claims) and buildup...Ch. 8 - A quality characteristic of interest for a...Ch. 8 - Call centers today play an important role in...Ch. 8 - The manufacturer of Boston and Vermont asphalt...Ch. 8 - The manufacturer of Boston and Vermont asphalt...Ch. 8 - Referring to the results in Problem 8.66...
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- A survey asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-time employees at your company over the next 12 months?" In the current survey, 232 of 400 executives answered Yes, while in a previous year survey, 168 of 400 executives had answered Yes. Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time. (Use current year - previous year. Round your answer to four decimal places.) to What is your interpretation of the interval estimate? The 95% confidence interval ---Select--- v zero. This suggests that the proportion of executives who are predicting an increase in full-time jobs for the current year is --Select-- v than the proportion of executives who were predicting an increase in full-time jobs for the previous year. Need Help? Read It Watch Itarrow_forward16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Undo A Bank * Clipboard 45°F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 X✓ fx B One-Year CD 0.5 0.7 1.05 0.35 0.4 0.2 0.5 1.9 0.7 0.55 0.45 0.55 0.45 0.6 1.8 0.9 1.4 2.25 1.1 H Select destination and press ENTER or choose Paste Font C Five-Year CD 4.9 4.9 4.9 PALS 3.4 4.1 4.05 3.85 4.25 4.65 4.1 4.4 3.55 4.3 5 4.1 4.25 5 4.6 4.9 SI D 20 21 22 23 24 25 11 E 17 0.9 0.55 0.55 0.3 1.25 2.05 ||| F |||| Alignment 4.45 4.45 4.05 3.5 4.45 4.1 G B Paste Options (Ctrl) H 171 560-0000 Numberarrow_forwardA Businessweek/Harris poll asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-time employees at your company over the next 12 months?" In the current survey, 230 of 500 executives answered Yes, while in a previous year survey, 196 of 500 executives had answered Yes. Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time (to 4 decimals). Do not round your intermediate calculations. .0000 to .1366 What is your interpretation of the interval estimate? Approximately ( 14% more executives are predicting an increase + in full-time jobs. The confidence interval shows the difference may be from 14% to 0%arrow_forward
- A survey asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-time employees at your company over the next 12 months?" In the current survey, 224 of 400 executives answered Yes, while in a previous year survey, 172 of 400 executives had answered Yes. Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time. (Use current year − previous year. Round your answer to four decimal places.) Incorrect: Your answer is incorrect. to What is your interpretation of the interval estimate? The 95% confidence interval is completely above Correct: Your answer is correct. zero. This suggests that the proportion of executives who are predicting an increase in full-time jobs for the current year is higher Correct: Your answer is correct. than the proportion of executives who were predicting an increase in full-time…arrow_forwardA Businessweek/Harris poll asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-time employees at your company over the next 12 months?" In the current survey, 230 of 500 executives answered Yes, while in a previous year survey, 197 of 500 executives had answered Yes. Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time (to 4 decimals). Do not round your intermediate calculations. to What is your interpretation of the interval estimate? Approximately 7% more executives are predicting an increase in full-time jobs. The confidence interval shows the difference may be from 0% to 13% Hide Feedback Partially Correctarrow_forward11. If the daily, 95% confidence level value at risk (VaR) of a portfolio is correctly estimated to be USD 10,000, which of the following statements are correct: I. In 1 out of 20 days, the portfolio value will decline by USD 10,000 or less. II. In 1 out of 20 days, the portfolio value will decline by USD 10,000 or more. III. In 19 out of 20 days, the portfolio value will decline more than USD 10,000. IV. In 19 out of 20 days, the portfolio value will not decline by USD 10,000 or more. (a) I (b) II (c) I and III (d) II and IV 12. Assume that portfolio daily returns are independently and identically normally distributed with mean zero. A new quantitative analyst has been asked by the portfolio manager to calculate portfolio VaRs for 10-, 15-, 20-, and 25-day periods. The portfolio manager notices something amiss with the analyst's calculations. Assuming the annualized volatilities of daily returns for the four periods are equal, which of the following VaRs on this portfolio is…arrow_forward
- A Businessweek/Harris survey asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-time employees at your company over the next 12 months?" In the current survey, 220 of 400 executives answered Yes, while in a previous year survey, 192 of 400 executives had answered Yes. Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time (to 4 decimals).arrow_forwardA Businessweek/Harris survey asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-time employees at your company over the next 12 months?" In the current survey, 220 of 400 executives answered Yes, while in a previous year survey, 192 of 400 executives had answered Yes. Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time (to 4 decimals). Use z-table. to What is your interpretation of the interval estimate? v in full-time jobs. The confidence interval shows the difference may be from Select v more executives are predicting Select Select v to Select varrow_forwardA Businessweek/Harris survey asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-time employees at your company over the next 12 months?" In the current survey, 240 of 500 executives answered Yes, while in a previous year survey, 198 of 500 executives had answered Yes. Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time (to 4 decimals). Use z-table. toarrow_forward
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