QUESTION 21"A student knows the average person takes 15 minutes to fall asleep, and wanted to compare this time value to patients with seasonaldisorder (SAD) to determine if they significantly differed. He observes that it takes his SAD sample of n = 34 take on averageasleep, with a sample variance = 26.6. Calculate the t-testistic the student would observe basedanswer to the second decimal place)."14.5 minuteson these observations. (Be sure to you re youraffectiveto fall

Answered: Image /qna-images/answer/010423a6-adf9-4c4a-9554-11a00eae13cf.jpg

Answered: QUESTION 21 "A student knows the…

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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Question #1 You observe the following data that represents the average outcomes of two groups of individualsthose who received an intervention ("Treated") and those who did not (“Not Treated")-over two periods before the treated group received the intervention and after. Group Treated Not Treated Before After 75 30 40 20 Compute the pre-/post- (BTs), cross section (Bxs), and difference-in-differences (Bpp) estimators of the causal impact of treatment.
QUESTION 1 Annual per capita consumption of milk is 21.5 gallons with a standard deviation of 4.8 galons. Being from the Midwest, you belleve milk consumption is higher there and wish to support your opinion A sample of 30 individuals from the Midwestern town of Webster City showed a sample mean annual consumption of 24.1 galons Which hypotheses can be used to determine whether the mean annual consumption in Webster City is higher than the national mean? Hou or equal to 216 Hau<218 Hou or equal to 21.0 H21.6 Hou 210 Ha: u not equal to 21.0 None of the above QUESTION 2 What is the value of the test statistic? 05206 28527 2400 QUESTION 3 What is the p-value? 00978 0022 38004 O. 9956
QUESTION 19 It was found that the mean annual turnover rate of the Aspirin medicine bottle is 19. The management think that the mean is changed. Therefore, a random sample of 86 is chosen that shows the average is 14 and the standard deviation is 14. Use 0.00 significance level to test this claim Bosed on the above, the test statistic is equal to? (Round answer to two decimal places ex. 2.09)
QUESTION 10 A magazine article cliams that the mean time of evening long-distance calls is 15.2 minutes per call. A researcher wished to test the claim and selected a random sample of 49 calls. She found that the mean time was 15.9 minutes and standard deviation was 5 minutes. Using a 0.05 level of significance, is there sufficient evidence to support the claim? Op-value=0.327, there is enough evidence to support the claim. p-value=0.164, there is enough evidence to support the claim. p-value=0.164, there is not enough evidence to support the claim. O p-value=0.327, there is not enough evidence to support the claim. QUESTION 11 The inspector at a manufacturing company claims that more than 2% of the produced smoke detectors are defective. A random sample of 255 smoke detectors is selected of which 10 are defective. Find the p-value of the test. (Round your answer to three decimal places).
QUESTION 32 "A clinican has found a significant effect of a new drug and wants to know the effect size. If the population mean =120 with a standard deviation = 19.5 and the clinical observed a sample of n = 64 had a mean = 116, then what would be the effect size in terms of Cohen's d?" 2.44 -1.64 0.21 -0.62
QUESTION 20 "Calculate the pooled variance for the following samples: Sample 1, n - 13 with a sample variance - 66.9. Sample 2, n-15 with a sample variance = 65.8. (Be sure to round answer to second decimal place)."
QUESTION 13 "Compared to an independent-measures design, a repeated-measures study is more likely to find a statistically significant effect because it reduces the contribution of variance due to O time-related factors. O order effects. the effect of the treatment. O individual differences.
QUESTION 42 "Calculate the pooled variance for the following samples: Sample 1, n = 40 with a sample variance = 84.3. Sample 2, n = 42 with a sample variance = 79. (Be sure to round answer to second decimal place)."
Question 5 > Past surveys indicate that 58% of Americans personally worry a great deal about federal spending and the budget deficit. Would it be considered unusual to have a random sample of 193 Americans where 143 of them personally worry a great deal about federal spending and the budget deficit? (We say that any observation more than 2 standard deviations from the mean is unusual.) оо Yes No Cannot tell from the information given
Question 5 The mean age when smokers first start is 13 years old with a population standard deviation of 1.9 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS-electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 35 smokers found that their mean starting age was 12.4 years old. Do the data support the claim at the 5% significance level? What are the correct hypotheses? Ho: Select an answer Critical Values = + Submit Question H₁: Select an answer ✓ ? ✓ Based on the hypotheses, find the following: Test Statistic z = years years (Give answer to at least 4 decimal places) (Give answer to at least 4 decimal places) Based on the above we choose to Select an answer The correct summary would be: [Select an answer mean age smokers first start is different than 13. that the claim that the
Question 6 "An electrical firm produces light bulbs that have a length of life that is approximately normally distributed with a mean of 660 hours and a population standard deviation of 25 hours. A new version of light bulbs is being produced and is assumed to be better than the previous version. To test this claim, a random sample of 92 new light bulbs are tested. Would you buy the new version of the light bulb or would you buy the older version if the random sample showed an average of 870 hours? Use a 0.05 level of significance." I will buy the older version until there is sufficient evidence to do otherwise. B I will buy the new version. C I will certainly buy the older version because I am 100% sure it is better. There is no sufficient data to make a sound conclusion.

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