Basic Business Statistics, Student Value Edition (13th Edition)
13th Edition
ISBN: 9780321946393
Author: Mark L. Berenson, David M. Levine, Kathryn A. Szabat
Publisher: PEARSON
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Textbook Question
Chapter 9, Problem 20PS
In Problem 9.18, 9.19, what are the Critical values of t if the level of significance,
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6. For a left-tailed test when n = 8 and a = 0.10 the critical value is
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a. 1.397
b. -1.397
C. 1.415
d. -1.415
1. The null hypothesis if you are trying to find out if you have enough evidence to conclude that the population means is different than 55 would be Ha: µ ≠ 55
True
False
2. A p-value of 0.017 provides more evidence against the null hypothesis than a p-value of 0.005.
True
False
1. A sample of data is collected from a group of college students (X = 112, Sx = 12, N = 58). It is hypothesized that members of
this group have higher test scores than the general population (u = 100, o = 15). What test do you conduct? Don't do the test,
just name the test and list the relevant equation for the test statistic.
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Chapter 9 Solutions
Basic Business Statistics, Student Value Edition (13th Edition)
Ch. 9 - If you use a 0.005 level of significance in a...Ch. 9 - If you use a 0.05 level of significance in a...Ch. 9 - If you use a 0.10 level of significance in a...Ch. 9 - If you use a 0.01 level of significance in a...Ch. 9 - What is your decision in problem 9.4 if...Ch. 9 - What is the p -value if, in a two-tail hypothesis...Ch. 9 - In problem 9.6, what is your statistical decision...Ch. 9 - What is the p-value if, in a two -tail hypothesis...Ch. 9 - In the U.S. legal system, a defendant is presumed...Ch. 9 - Suppose the defendant in Problem 9.9 is presumed...
Ch. 9 - Many consumer groups feel that U.S. Food and Drug...Ch. 9 - As a result of complaints from both students and...Ch. 9 - Prob. 13PSCh. 9 - The quality-control manager at a compact...Ch. 9 - Suppose that in Problem 9.14, the standard...Ch. 9 - A bottled water distributor wants to determine...Ch. 9 - Suppose that in Problem 9.16, the standard...Ch. 9 - If, In a sample of n=16 selected from a normal...Ch. 9 - In Problem 9.18, how many degrees of freedom does...Ch. 9 - In Problem 9.18, 9.19, what are the Critical...Ch. 9 - In, Problem 9.18, 9.19, and 9.20, what is your...Ch. 9 - If, in a sample of n=16 selected from a...Ch. 9 - If, in a sample of n=160 selected from a...Ch. 9 - You are the manager of a restaurant for a...Ch. 9 - A manufacturer of chocolate candies uses machines...Ch. 9 - Prob. 26PSCh. 9 - The U.S. Department of Transportation requires...Ch. 9 - The file FastFood contains the amount that a...Ch. 9 - An insurance company has the business objective of...Ch. 9 - The following data (in Drink) represent the amount...Ch. 9 - One of the major measures of the quality of...Ch. 9 - A manufacturing company produces steel housings...Ch. 9 - One operation of a steel mill is to cut pieces of...Ch. 9 - In Problem 3.69 on page 156, you were introduced...Ch. 9 - Prob. 35PSCh. 9 - In a one-tail hypothesis test where you reject H0...Ch. 9 - In Problem 9.36, what is your statistical decision...Ch. 9 - In a one-tail hypothesis test where you reject H0...Ch. 9 - In Problem 9.38, what is your statistical decision...Ch. 9 - In a one-tail hypothesis test where you reject H0...Ch. 9 - In Problem 9.40, what is your statistical decision...Ch. 9 - In a one-tail hypothesis test where you reject H0...Ch. 9 - In Problem 9.42, what is your statistical decision...Ch. 9 - In a one-tail hypothesis test where you reject H0...Ch. 9 - In Problem 9.44, what is your statistical decision...Ch. 9 - Prob. 46PSCh. 9 - Prob. 47PSCh. 9 - Prob. 48PSCh. 9 - You are the manager of a restaurant that delivers...Ch. 9 - A survey of nonprofit organizations showed that...Ch. 9 - Prob. 51PSCh. 9 - If, a random sample of 400 items, 88 are...Ch. 9 - In Problem 9.52, if the null hypothesis is that 20...Ch. 9 - In Problem 9.52 and 9.53, suppose you are testing...Ch. 9 - Prob. 55PSCh. 9 - The worldwide market share for the Mozilla Firefox...Ch. 9 - One of the issues facing organizations Is...Ch. 9 - Prob. 58PSCh. 9 - A cellphone provider has the business objective of...Ch. 9 - Prob. 60PSCh. 9 - What is the difference between a null hypothesis,...Ch. 9 - What is the difference between a Type I error and...Ch. 9 - What is meant by the power of a test?Ch. 9 - What is the difference between a one -tail test...Ch. 9 - What is meant by a p-value?Ch. 9 - How can a confidence interval estimate for the...Ch. 9 - What is the six-step critical value approach to...Ch. 9 - What is the five-step p-value approach to...Ch. 9 - In hypothesis testing, the common level of...Ch. 9 - Financial institutions utilize prediction models...Ch. 9 - Prob. 71PSCh. 9 - The owner of a speciality coffee shop wants to...Ch. 9 - An auditor for a government agency was assigned...Ch. 9 - A bank branch located in a commercial district of...Ch. 9 - Call centers today play an important role in...Ch. 9 - An important quality characteristic used by the...Ch. 9 - Studies conducted by the manufacturer of Boston...Ch. 9 - The manufacturer of Boston and Vermont asphalt...Ch. 9 - Referring to the results of problems 9.76 through...
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- A researcher administers a treatment to a sample of n=36 selected from a population with u=30 and o=2. If the sample mean after treatment is M=32, then Cohen’s d=1.00. True or False?arrow_forward4. The amount of contaminants in two independent samples (comprised of independent subjects) from two distinct bird species is measured in a veterinary hospital. The summary of the data is presented below. Data from Pop. 1 Data from Pop. 2 n1=13 71=1.12 $1=0.52 72=D15 I2=1.49 S2=0.70 We are interesting in testing Ho: -P2=0, versus H,: A-A20. And we will mnake the normality assumption. (a) Suppose that we know the population variances: of = 0.1, o = 0.2. Design the test and find its pvalue. What conclusion do you reach at significance level 5%? (b) Suppose that the researchers do not trust these population vari- ance values, and would like to do the test based on the sample variances provided above. Assuming equal variance, how would your conclusions changed? %3Darrow_forward2) Suppose that we are testing Ho:µ = 4 vs Ha: µ > 4. A p-value of 0.023 was determined. Which of the following is a correct interpretation of this p-value? (a) The null hypothesis would be rejected at a 5% level but not a 1% level. (b) The null hypothesis would be rejected at a 1% level but not a 5% level. (c) The null hypothesis would be rejected at both 5% and 1% levels. (d) The null hypothesis would not be rejected at either the 5% or 1% level.arrow_forward
- Need parts b and carrow_forwardSuppose M₁ and M₂ are two models where from prior knowledge we believe P(M₁) = 0.25 and P(M₂) = 0.75. We then observe a data set D. Given each model the likelihood of D is P(D|M₁) = 0.5 and P(D|M₂) = 0.01. Given data D which model has a higher accuracy, or probability to be correct?arrow_forwardFor a population with a μ = 80 and σ = 10 find the X value (score) that corresponds to each of the following z-scores. Z = +1.00 Z = +.20 Z = +1.50 Z = -.50 Z = -2.00 z = -1.50arrow_forward
- Refers to the population which consists of the objects or entities under consideration in the survey A. sampled population B. statistical population 2. Random sampling is a random (or statistical) experiment a. true b. false 3. Given two estimators A1 and A2, we say that A1 is more efficient than A2 if V[A1] < V[A2]. a. true b. falsearrow_forward37arrow_forwardSuppose that a researcher developed a drug that she claims increases extroversion. A sample of n = 4 participants has a sample mean of M = 115 on a personality assessment after taking the drug. The personality test has a population mean of μ = 100 and σ = 30. Is the sample mean an especially unlikely result based on the population parameters for the personality test? What if the researcher increased the sample to n = 25 and observes the same sample mean of M = 115? For M = 115 and n = 4 scores: z = , which indicates that the sample mean especially unlikely. For M = 115 and n = 25 scores: z = , which indicates that the sample mean especially unlikely.arrow_forward
- If, in a sample of n=20 selected from a normal population, X = 54 and S = 12, what is your statistical decision if the level of significance, a is 0.01, the null hypothesis, Ho. is i = 50, and the alternative hypothesis, H, is #502 Click here to view page 1 of the table of the critical values of t. Click here to view page 2 of the table of the critical values oft. Determine the critical value(s). The critical value(s) is(are)| (Round to four decimal places as needed. Use a comma to separate answers as needed.)arrow_forwardpoll taken of 500 voters three months before the election showed that 55% favored the Republican candidate with a margin of error of 4%. A second poll of 500 voters taken two weeks later showed that 45% favored the Republican candidate, again with a margin of error of 4%. Consider the following possible explanations for these results.1. At least one of the polls is wrong since the ranges of possible values of the population parameter do not overlap.2. Both polls are right, but voters changed their minds between the two polls.3. One of the polls selected a sample that was not representative of the population.Which statements are possible explanations of the results?A) Statements 1, 2, and 3B) Statements 1 and 2C) Statements 1 and 3D) Statements 2 and 3arrow_forwardIf the t-computed value is 2.115 and the critical value is 2.423, what will be the decision? a. Reject the null hypothesis. b. Do not reject the null hypothesis. c. Reject both the null and alternative hypotheses. d. Support both the null and alternative hypotheses.arrow_forward
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