A researcher is interested in finding a 95% confidence interval for the mean number of times per day that collegestudents text. The study included 133 students who averaged 30.4 texts per day. The standard deviation was 22.7 texts.Round answers to 3 decimal places where possible.a To compute the confidence interval use adistribution.b. With 95% confidence the population mean number of texts per day is betweenandtexts.c. If many groups of 133 randomly selected members are studied, then a different confidence interval would beproduced from each group. Aboutnumber of texts per day and aboutdaypercent of these confidence intervals will contain the true populationpercent will not contain the true population mean number of texts per

a.Find the distribution that has to be used to construct the confidence interval in the given…

Answered: A researcher is interested in finding a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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One of the following is classifies as interval level: Select one: a. Height of the student b. Area of a house c. Weight of the student d. Body temperature
The time to travel to school for high school students in South Bend is known to have a normal distribution with a standard deviation of o = 15 minutes. You take a simple random sample of 40 South Bend high school students students, and their average time to travel to school is 25 minutes. Find the 90% confidence interval for the population mean time. O A. (21.91, 28.09) B. (21.96, 28.04) O C. (21.00, 29.00) D. (21.10, 28.90)
Suppose that the number of points scored in a game comes from a normal population with an average of 12 points and a standard deviation of 9 points. Estimate the chance that the average points scored in ten randomly selected games will exceed 14.2 points. A. 0.4034 B. 0.0073 C. 0.2198 D. 0.2297
Tina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
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A group of five friends are long-distance runners who will be running in an upcoming marathon. To prepare for the marathon, each of the friends recorded the number of miles they ran each week for 12 weeks. The results of the friends' training are shown in the data set provided below. Which of the friends was the most consistent with the number of miles run each week during the training? Hint: You should not need to compute the standard deviation for each friend. Ashton Caleb Jordan Kyle Noah 24 35 22 15 13 34 36 39 26 29 25 34 26 24 18 31 35 41 25 31 19 37 38 27 15 33 35 37 24 19 27 34 40 25 27 29 36 27 26 32 36 35 21 32 15 16 33 42 24 17 18 36 33 21 28 26 35 35 27 21
We would like to create a confidence interval for the mean. Which of the following would produce the smallest margin of error? Select one: a.A 95% confidence level and a sample size of 150 subjects b. A 99% confidence level and a sample size of 600 subjects. c. A 99% confidence level and a sample size of 150 subjects. d.A 95% confidence level and a sample size of 600 subjects.
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Imagine the mean women’s foot size is a 7.5 with standard deviations of 1.5. a. What percentage of women have a foot size larger than 10? b. If you select 30 people at random is it likely that any of them will have a foot size larger than 10? If so, how many?

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