A middle school teacher believes that a reading rewards program results in a higher number of pages read per yearafter the program is completed. The teacher chooses a simple random sample of students and records the number ofpages read per year before starting the program and after the program is completed. The results of the study arebelow.What are the population parameters?PickMeanVarianceObservationsHypothesized Mean Differencedft StatP(T<=t) one-tailt Critical one-tailP(T<=t) two-tailt Critical two-tailConfidence LevelBefore813.25192250.25 182875.2210010001981.4970.0681.6530.1361.97295%After904.95 What is the level of significance? Ex: 0.12Is the two-sample hypothesis test a paired or unpaired t-test? PickThe null hypothesis is Ho: after PickThe alternative hypothesis is Ha : Mafter PickShould Ho be rejected or does Ho fail to be rejected? PickWhat conclusion can be drawn from the data?PickMbeforebefore✓evidence exists to support the claim that the mean number of pages read per year after the program ishigher than before the program.

1 Here u is the population parameter 2 level of significance (α) = 1- 0.95 = 0.05 3 the given data…

Answered: parameters? Before 813.25 92250.25…

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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Hypothesis Testing with a Sample Mean Previously, an organization reported that teenagers spend 4.5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was 4.75 hours with a sample standard deviation of 2.0. Conduct a hypothesis test. The null and alternative hypotheses are: O Ho: p = 4.5 H.u > 4.5 O Ho: u 2 4.5 H p 4.75 O Ho:p = 4.5 H p > 4.5
Which of the following is a two-tailed test? O Ho: µ = 89, H1: u 84 O Ho: µ = 54, H1: u # 54
The chi-square statistic for this table is 28.8. Can you reject the null hypothesis? Why or why not? Opinion on Welfare Encouraging Out-of-Wedlock Children by Education, 1986 < High School High School Some College Total Graduate Studies Strongly Agree 26.7 22.2 13.4 16.8 21.7 Agree 39.2 40.7 35.6 39.4 39.5 Disagree 28.8 32.9 43.7 41.6 34.0 Strongly Disagree 5.2 4.2 7.3 2.2 4.9 Total 100.0 100.0 100.0 100.0 100.0 Source: GSS 1986
Questions Exercise 10.29 Algo (Inferences About the Difference Between Two Population Proportions) 1. 2. Consider the hypothesis test below. Ho P₁ P2 ≤0 Ha P1 P20 The following results are for independent samples taken from the two populations. b. With a = 0.05, what is your hypothesis testing conclusion? - Select your answer - Sample 1 n1 = 200 P1 0.23 Use pooled estimator of p. a. What is the p-value (to 4 decimals)? Use Table 1 from Appendix B. Icon Key = + Sample 2 N2 = 300 P2 = 0.15 Exercise 10.29 Algo (Inferences About the Difference Between Two Population Proportions) ◄ Question 2 of 2 Hint(s) Check My Work Hint(s) Check My Work ◄ Question 2 of 2
65 homeless people in San Jose were asked their age. The sample mean age was 33.2 years. Let x be a random variable representing ages of homeless people in San Jose. Assume that x has a normal distribution and o = 7.3 years. Do the data indicate that the mean age of the population of homeless people in San Jose is less than 35 years old? Use a = 0.05. Identify the following in your answer. 1. Identify the null hypothesis Ho and alternate hypotheses H, for the problem. 2. Identify the sample statistic, test statistic, p-value and calculator key used: Sample Statistic (sample mean) (Stated in problem) = Test Statistic (z) (Round to two decimal places) %3D P-value: (Round to four decimal places) = Calculator key used: 3. Identify the significance level and determine if you reject or fail to reject the null hypothesis. significance level = Do you reject or fail to reject Ho ? 4. State your conclusion. Upload your answer. Remember you can only upload one document. Upload Choose a File
An electrician wants to know whether batteries made by two manufacturers have significantly different voltages. The voltage of 131 batteries from each manufacturer were measured. The population standard deviations of the voltage for each manufacturer are known. The results are summarized in the following table. Manufacturer Sample mean voltage (millivolts) Population standard deviat A 116 3 115 4 What type of hypothesis test should be performed? Right-tailed z-test v What is the test statistic? Ex: 0.12 Does sufficient evidence exist to support the claim that the voltage of the batteries made by the two manufacturers is different at the a = 0.01 significance level? Select v
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Test the claim that the mean GPA of night students is smaller than 2.5 at the 10% significance level. The population standard deviation for this group is known to be 0.16. The null and alternative hypotheses for this test are: Но: д 2.5 Нд:д > 2.5 НА:Д < 2.5 The test is: left-tailed right-tailed Based on a sample of 30 people, the sample mean GPA was 2.47. Hint: Before you find the p-value below, calculate the test statistic to two decimal places. The p-value is: (to 4 decimals) The significance level as a decimal is: Based on this we O fail to reject the null hypothesis, Ho O reject the null hypothesis, Ho
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A Shapiro-Wilk result had a p-value of 0.05. Which of the following statements is best? O O O There is a 5% chance that the data is truly different from the normal curve There is a 5% chance that the data presented is only due to coincidence There is a 95% chance that the data is truly different from the normal curve There is a 95% chance that the data presented is only due to coincidence 7
Question Help v Listed below are the lead concentrations in ug/g measured in different traditional medicines. Use a 0.01 significance level to test the claim that the mean lead concentration for all such medicines is less than 18 ug/g. Assume that the sample is a simple random sample. 12.5 17.5 22 6.5 18 18 16 19 6.5 D Assuming all conditions for conducting a hypothesis test are met, what are the null and alternative hypotheses? Ο Α. Ho μ 18 μga H,: µ#18 ug/g O B. Ho: = 18 ug/g H;: µ 18 ug/g O D. Ho: u> 18 µg/g Η : μ< 18 μg Determine the test statistic. |(Round to two decimal places as needed.) Determine the P-value. (Round to three decimal places as needed.) State the final conclusion that addresses the original claim. V Ho. There is evidence to conclude that the mean lead concentration for all such medicines is V 18 μg g. ? Click to select your answer(s). MacBook Ai DII 80 888 F7 FS FA F3 esc F2 & de 23 %24 8 5 6 7 2 3 4 1 P U Q W E 11 J K F G I
0 123 ess is functioning properly. significance. 5 workers from one company But a general perception is 1 of significance mnle 6.32 Jeffery, a high school swimmer, swims the 25-yard freestyle with a mean time of 16.43 seconds without using goggles. After his father bought him goggles, Jeffery swam the 25-yard freestyle 15 times. After the 15 swims, Jeffery's mean time was 16 seconds and sample standard deviation was 2 seconds. His father thought the goggles helped Jeffery swim faster. Test his father's hypothesis using a 5% level of significance. Assume that the sample of measurements are from a normally distributed population. 6.30 suburb.

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