The mean number of credits earned by students is claimed to be 30.0. A random sampleis taken to test if the mean is different. The sample has x = 31.2 s= 2.1, and n= 40.%3DUse this data to solve problems 7 through 11.The stem and leaf plot below shows the running times in a 400 m run for a randomsample of 19 runners. 6|0 represents 60 seconds. Use this data for questions 18through 21.5|896|015587|02466898|12335For a one samplet-test with sample size 58, the degrees of freedom is:а. 58O b. 59О с. 57 Using the data on no. 2:A one sample ttest is conducted with H a: µ > 14. If t= 2.08and n= 31, the p-value isO a. between 0.02and 0.025O b. between 0.01and 0.02O c. between 0.005 and 0.01

TO find, 1) For a one sample t test with sample size 58 , the degrees of freedom is: 2) For one…

Answered: Using the data on no. 2: A one sample…

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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Compute the value of the test statistic and conclude.
A large automobile insurance company selected samples of single and married male policyholders and recorded the number who made an insurance claim over the preceding three-year period. Single Policyholders Married Policyholders n1=550 n2=1,000 Number making claims = 110 Number making claims = 150 a. Use a=0.05 Test to determine whether the claim rates differ between single and married male policyholders. z-value (to 2 decimals) p-value (to 4 decimals) b. Provide a 95% confidence interval (to 4 decimals) for the difference between the proportions for the two populations. Enter negative answer as negative number. ( , )
You receive a brochure from a large university. The brochure indicates that the mean class size for full-time faculty is fewer than 31 students. You want to test this claim. You randomly select 18 classes taught by full-time faculty and determine the class size of each. The results are shown in the table below. At a = 0.05, can you support the university's claim? Complete parts (a) through (d) below. Assume the population is normally distributed Ha μ#31 33 26 (b) Use technology to find the P-value. 25 30 28 38 33 36 H₂ μ31 EN 25 28 310 24
Fifteen different video games showing alcohol use were observed. The duration times of alcohol use (in seconds) were recorded. When using this sample for a t test of the claim that the population mean is greater than 76 sec, what does df denote, and what is its value? What does df denote? O A. The sample size O B. The sample standard deviation C. The number of degrees of freedom O:D.The test statistic The value of df is. (Type an integer or a decimal. Do not round.)
In a one - sample t-test, the results are as follows: t(31) = -3.41, p <0.01. How many data points were there in the analysis that produced this result? 30 31 32 O 29
For a one-sided t-test with H0 : μ ≤ 10 vs. Ha : μ > 10, which of the following t-statistics would result in the largest p-value? Explain why. A. 2.55 B. -2.55 C. 1.43 D. -1.33 E.3.22
Solve the problem. Find the standardized test statistic t for a sample with n = 15, x = 8.7, s = 0.8, and a = 0.05 if Ho: Hs 8.4. Round your answer to three decimal places. a. 1.452 b. 1.631 c. 1.728 d. 1.312
State the conclusion based on the results of the test. The mean of the pressure required to open a certain valve is known to be u = 6.7 psi. Due to changes in the manufacturing process, the quality-control manager feels that the average pressure has changed. The null hypothesis was rejected. Choose the correct answer below. O A. The mean of the pressure has not changed. O B. There is not sufficient evidence that the mean of the pressure required to open a certain valve has changed. O C. There is not sufficient evidence that the mean of the pressure required to open a certain valve has not changed. O D. The mean of the pressure has changed. O E. There is sufficient evidence that the mean of the pressure required to open a certain valve has changed. O F. There is sufficient evidence that the mean of the pressure required to open a certain valve has not changed.
. The statistic of z = -1.94 is obtained when testing the claim that p = 3⁄8

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Using the data on no. 2: A one sample t-test is conducted with H a: u > 14. If t= 2.08 and n= 31, the p-value is a. between 0.02 and 0.025 O b. between 0.01 and 0.02