We take a sample of 218 men and find they have an average commute time of 32 minutes with a standard deviation of 7 minutes. a.) Construct a 95% confidence interval. b.) Describe the interpretation of the confidence level.

We take a sample of 218 men and find they have an average commute time of 32 minutes with a standard deviation of 7 minutes. a.) Construct a 95% confidence interval. b.) Describe the interpretation of the confidence level.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: A survey administered in a certain socioeconomic group gathered information to assess self-esteem of…

Q: The results of a study of 268 students who paid a private tutor to help them improve their scores on…

Q: Suppose that Jerry (a baker) wants to find a 95% Confidence Interval for the mean baking time for…

A: We have given that, Sample mean (x̄) = 16.4, standard deviation (s) = 2.2 and sample size (n) = 40…

Q: The correct value of Z to use for an 80% confidence interval for is: O A. 1.96 О В. 1.28 O C. 2.33 O…

Q: 1. Find the 98% confidence interval (CI) and margin of error (ME) for the mean heights of men when:…

Q: A 99% confidence interval for a mean: a. In repeated samples will include the true population mean…

Q: In a study, 132 children of a certain race in a certain city were randomly assigned to one of two…

A: Step 1: Given: For the Preschool group:42 graduated from high school (say x1)and altogether there…

Q: 1. We are interested in determining if absences from a class affect your overall class grade. The…

A: Hey, since there are multiple subparts posted, we will answer first three subparts. If you want any…

Q: Campus athletics is interested in the proportion of registered students living on campus who play…

A: We are given that 95% confidence interval is correctly calculated from the given data as (0.12,…

Q: Which of the following is thet-value for a 95% confidence level when the sample size is 20. O a.…

Q: a. Calculate a 95% confidence interval for the mean number of hours slept in the Population, using…

A: Data 4.5 5 5 6 6 6 6 6 6 6 6.3 6.5 6.5 6.5 6.5 6.5 6.5 6.5 7…

Q: Students at Green River plans a study to stats Test scores. Previous research has shown the…

A: We have given that Margin of error =E =0.5 Population Standard deviation = 1 99%confidence…

Q: A researcher wishes to determine whether people with high blood pressure can reduce their blood…

A: Treatment group

Q: The data represent a sample of the number of casualties in a road accident for the past several…

A: Solution: x (x-x) (x-x)2 450 -34.7143 1205.082 509 24.28571 589.7959 609 124.2857…

Q: If n = 28, ¯xx¯ = 49, and s = 19, construct a confidence interval at a 90% confidence level. Assume…

A: Given information- Sample size, n = 28 Sample mean, x-bar = 49 Sample standard deviation, s = 19…

Q: In a random sample of 850 Americans, 385 reported that they work two jobs. Which of the following…

A: The known values are, The sample proportion is,

Q: A group of researchers wants to estimate the true mean skidding distance along a new road in a…

A: Given: n = 20 Formula Used: Confidence Interval = X ± Sntn-1

Q: Please answer number 11.

A: Sample mean =40(using the formula ‘=AVERAGE (A1:A8).Sample standard deviation, s = 5.5549(using the…

Q: Which of the following would result in the narrowest confidence interval? A. 80% confidence level…

A: The narrowest confidence interval will result from larger sample size and a smaller confidence…

Q: A history teacher records the SAT scores of all 87 of her students. The data is used to construct a…

A: For calculating the confidence interval, we need to satisfy the following conditions: Independence…

Q: A public health official in Martin county needs to estimate the average diastolic blood pre…

A: Given: Sample size(n)=132Meanx¯=89Population standard deviationσ=10

Q: A 95% confidence interval for the population proportion of professional tennis players who earn more…

A: 95% confidence interval for p : (0.82,0.88)Sample size used(n) = ? Margin of error : E = sample…

Q: sample of 16 students was taken from university. These students spent an average of $170 on books…

Q: How important is it for a waiter or waitress to complement the customers' dinner selection. A waiter…

A: For customers that were not complemented The average tip was 16% so the proportion is p1⏞=0.16 The…

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: A recent survey of 54,000 randomly selected adults studied the religious affiliations of Americans.…

A: From the provided information, Sample size (n) = 645 From which 116 said they claimed no religious…

Q: A poll conducted randomly in 2014 found that 52% of U.S. adult Twitter users get at least some news…

A: Proportion is 0.52. The standard error 0.024 The absolute value of Zα/2 is 2.5758 using the Excel…

Q: A sample of 50 students was taken from the local university. These students spent an average of R170…

A: Given information- Sample size (n) = 50 Mean x̅ = R170 Standard deviation (s) = R25.50 Significance…

Q: The branch manager of an outlet store (Store 1) of a nationwide chain of pet supply stores wants to…

A: Comment: As per the our company guidelines we are supposed to answer only three subparts. Kindly…

Q: The County Development Agency does a survey of all the mobile home manufacturers in Clarion County…

Q: Calculate Tom's point estimate. Given that the estimated standard er- ror of (p1 + p2)/2 is 0.024,…

A: Here use given z critical value for construction of interval estimate

Q: A student organization conducted a statistical study to calculate a 95% confidence interval for the…

A: Hence,

Q: Which type of confidence interval should you use in this situation? A sample of 400 racing cars…

A: Given Information:Sample size (n) = 400 racing carsNumber of cars costing over $700,000 =…

Q: In a survey of 2105 adults in a recent year, 737 made a New Year's resolution to eat healthier.…

Q: Which of the following would result in the narrower confidence interval?

A: Note: The confidence interval with small confidence level has the narrower confidence interval. The…

Q: Suppose that a random sample of 128 graduate-admissions personnel was asked what role scores on…

A: From the provided information, Sample size (n) = 128 From which 70 answered "very important". Sample…

Q: A researcher is interested in finding a 90% confidence interval for the mean number of times per day…

A: Given data A researcher is interested in finding a 90% confidence interval for the mean number of…

Q: In a study, 110 children of a certain race in a certain city were randomly assigned to one of two…

A: There are two independent samples which are Preschool and No Preschool. We have to construct 95%…

Q: A sample of freshman takes a reading comprehension test and their scores are summarized below.…

Q: Solve the problem. Fifteen SmartCars were randomly selected and the highway mileage of each was…

A: Note: According to bartleby experts question answers guidelines an expert can solve only one…

Q: Given that degrees of freedom is 18 at 95% confidence level, the value of t =________. Select one:…

A: Given that degrees of freedom is 18 at 95% confidence level since the hypothesis is left tailed or…

Q: A sample of 30 days of sales were taken. The mean of those 30 days of sales were $10,000 with a…

A: Given values, sample size (n) = 30 Mean = 10,000 Standard deviation = 2000 z value for 95%…

Q: A survey asked, "How many tattoos do you currently have on your body?" Of the 1217 males surveyed,…

A: The provided information is as follows:The total number of males surveyed is .The number of males…

Question

We take a sample of 218 men and find they have an average commute time of 32 minutes with a standard deviation of 7 minutes.

a.) Construct a 95% confidence interval.

b.) Describe the interpretation of the confidence level.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1: Determine the given variable

VIEW

Step 2: Calculate the given Confidence interval

VIEW

Solution

VIEW

Step by step

Solved in 3 steps with 8 images

SEE SOLUTION Check out a sample Q&A here

Similar questions

In a sample of 7 observations, the values are 17, 11, 12, 13, 14, 15. 16. Find the 95% confidence interval for the population mean. O A. (5.00, 9.00) O B. (4.00, 8.00) OC (12.00, 16.00) OD.(11.00, 15.00)
A sample of 100 shoppers chosen at random from all shoppers in a given province indicated that 55% of them preferred a particular store (Shoprite).i. Find a 95% confidence interval for the proportion of all the shoppers that preferred Shoprite.ii. How large a sample of shoppers should we take in order to be 95% confident that the shoppers will buy from Shoprite?
50 of the 600 medical students who were chosen at random stated they intended to work in a rural area. Calculate the 90% confidence interval for the actual percentage of medical students who intend to practice in rural areas. The responses shown here are estimates.
Please answer all. Thank you. The width of a confidence interval for a proportion will be A.) wider for sample of size 100 than for a sample size of 50 B.) wider when the sample proportion is 0.50 than when the sample proportion is 0.20 C.) wider for 90 percent confidence than for 95 percent D.) narrower for 99 percent confidence than for 95 percent Which of the following is not a property of a normally distributed data. A.) the mean, median and mode coincide at the center B.) area under curve is 1 C.) the width of curve is determined by the mean of distribution. D.) the curve is symmetrical about its center.
The following data represent a random sample of five measurements from a normally distributed population: 7,4,2,5,7 a. Find 90% confidence interval for u. b. Find a 99% confidence interval for u.
tion. Use this information to construct the 90% and 95% confidence intervals fc of the confidence intervals. ce of a certain stock was $123.13. Assume the population standard deviation is
A survey of 32,782 adults in 2004 indicated that 24.6% of adults were current smokers. A similar study conducted in 1995 of 40,000 adults indicated that 29.7% were current smokers. a. Find and interpret a point estimate of the difference between the proportion of current smokers in 1995, and the proportion of current smokers in 2004. b. A 95% confidence interval for the true difference is (-0.058,-0.045). Interpret. c. What assumptions must you make for the confidence interval i part b to be valid? (…) a. Find a point estimate of the difference between the proportion of current smokers in 1995 and the proportion of current smokers in 2004. (Round to three decimal places as needed.)
create a 90% confidence interval for the following data: x = 25 n = 100
A study examined parental influence on teenagers' decisions to smoke. A group of students who had never smoked were asked about their parents' attitudes to smoking. The students were questioned two years later to see if they had started smoking. The study found that, of the 287 students whose parents disapproved, 58 became smokers. Of the 48 students with lenient parents, 11 smoked. Complete parts a through c below. a) Create a 95% confidence interval for the difference between the proportion of children with lenient parents who later smoked, p1, and the proportion of children with disapproving parents who later smoked, p2. The confidence interval for p1−p2 is −0.101negative 0.101,0.1550.155. (Round to three decimal places as needed.) b) Interpret your interval in this context. Select the correct choice below and fill in the answer boxes within your choice. (Round to one decimal place as needed.) A. There is 95% confidence that the proportion of teens…
In a sample of 100 college students, 25 of them own a car. Calculate the 95% confidence interval for the true population of college students who own a car. Choose the closest one. A. (0.165132, 0.334868) B. (0.231725, 0.452302) C. (0.25, 0.75) D. (0.1, 0.9)
A survey is done and 97 out of 130 students support the implementation of the new cafeteria menu for lunch
The following is the number of hours of sleep obtained by eight college freshmen. Use the data to find a 92% confidence interval for the true mean number of hours of sleep by college freshmen. 7.5 8.0 6.5 24 8.5 6.5 7.0 7.5