QUESTION 3 A scents puls a random sample of 12 people into a r OA quantitative and cross sectional OB categoncal and time series OC categorical and cross-sectional OD quantitative and time series and checks all of them at the same t handed Which of the following classifications comect of the
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- Question 11Question 3 The average score of all sixth graders in school District A on a math aptitude exam is 75 with a standard deviation of 8.1. A random sample of 80 students in one school was taken. The mean score of these 100 students was 71. Does this indicate that the students of this school are significantly different in their mathematical abilities than the average student in the district? Use a 5% level of significance.Question 22 An article reports that its author used a 25-item test (with dichotomous scoring for each item), the mean of total test scores was 14, and the standard deviation of the total test scores was 6. Estimate reliability.
- QUESTION 2 To test the effect of a new medication on pulse rate, the researcher randomly selected the 60 subjects into two groups of 30. New medicine and placebo were given to Group 1 and Group 2, respectively. Below is the Minitab output. Two-Sample T-Test and CI Group 1 N Мean StDev 7.80 SE Mean 30 65.20 1.4 2 30 70.30 8.40 1.5 Difference = mu (1) - mu (2) Estimate for difference: -5.10 95% CI for difference: (-9.29, -0. 91) T-Test of difference = 0 (vs not =): T-Value = -2.44 P-Value=0.018 DF=57 i) State the formula you would use to construct a 95% confidence interval. Include the value of a and degrees of freedom that you will use to find the critical value in the formulaQuestion 3 Mr Martin can drive to work along four different routes. The following are the number of minutes the journey takes on five different occasions for each route: Route 1 Route 2 Route 3 Route 4 22 25 26 26 26 27 29 28 25 28 33 25 26 30 30 31 29 33 30 Copy and complete the following ANOVA Table and test if all routes are equally fast. Test using a = .05 Source DF SS MS F Group Error Total 27Question #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 3 According to a Kaiser Family Foundation survey, children aged 8 to 18 years in the United States spend an average of 190 minutes per day watching television. A recent random sample of 4 such children showed the following results: 200, 210, 230, 220 (in minutes) At the 5% level of significance, can you conclude that the current mean time spent watching television per day by children in this age group differs from 190 minutes? a)Step 1: State the null and alternative hypotheses. b)Step 2: Write down the appropriate test statistic (formula) , but first check assumptions c) Step 3 :Write down the rejection region of your test. d)Step 4: Compute the value of the test statistic (i) The sample mean = The sample standard deviation = (iii) The value of the test statistic = e) Step 5: State your conclusion: (i) Reject Ho Do not reject Ho (Just circle) (ii) In one sentence apply the results to the problem. f)What type of mistake could you have made in your hypothesis test? (Just circle…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(14): A researcher wanted to know whether children who live in two different neighbourhood (Willowdale and Forresthill) got different amount of excerise. Children were randomly selected from the two neighbourhoods (40 in each). and filled out the daily activity report to measure their excerise. The number of minutes of excerise were tallied and recorded. The The researcher then conducted an independent sample t test using MS-EXCELL. The result are shown in the image below. Inspect the MS- EXCELL output.Did the researcher conduct their t test assuming equal variance.? Write out Step 5 by including both the formal answer and the conclusion. The five steps are: Step 1:State the hypotheses and identify the claim. Step 2: Compute the test value Step 3: Compute the critical value. Step 4:Make the decision (reject or not reject) Step 5:Summaize the results. Note: you only need to submit step 5, and round snswer to decimal places MS-EXCELL output:…
- Question 7 Ten students independently performed an experiment to estimate the value on 7. Their results were: (a) (b) (c) 3.12, 3.16, 2.94, 3.33, 3.00, 3.11, 3.50, 2.81, 3.02, 3.10 Given that x² = 97.0011, calculate the sample mean, and sample variance, s². Stating any necessary assumption that you make, calculate a 95% confidence interval for based on these data. Estimate the minimum number of results that would be needed if it is required that the width of the resulting 95% confidence interval should be at most 0.02.The following TI-84 Plus display presents some sample statistics. 1-Var-Stats x =68 Ex=2291 E x=182,361 Sx=6 Ox=6.066300355 1 n=29 Part 1 of 3 (a) Assume that a histogram of the sample is bell-shaped. Approximately what percentage of the sample values are between 62 and 74? Approximately 95% - of the sample values fall between 62 and 74. Part: 1 / 3 Part 2 of 3 (b) Assume that a histogram for the sample is bell-shaped. Between what two values will approximately 95% of the sample be? and Approximately 95% of the sample values will fall betweenQuestion 23 [CLO-1] The data set (1,3,5,7,9) has a first quartile of 0 8 03 01 05
