A B C D 12 20 10 10 32856 24 18 a.) State the researcher's null and alternative hypotheses (using symbols OR everyday language) b.) Is this a one or a two-tailed test? c.) Find the critical value (alpha = .05) I

paired T test for the following:  My project question is: Did the mental health decline after COVID? Score 1 is the avg mental health score pre-covid, score 2 is the avg mental health score post- covid. Show your work.

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The average wait time to get seated at a popular restaurant in the city on a Friday night is 13 minutes. Is the mean wait time less for men who wear a tie? Wait times for 16 randomly selected men who were wearing a tie are shown below. Assume that the distribution of the population is normal. 11, 14, 14, 14, 13, 13, 10, 11, 10, 10, 12, 10, 12, 14, 13, 11 What can be concluded at the the a = 0.05 level of significance level of significance?

Based on the Cl for the difference you see in this figure, you know that in the NHST approach: Interview Interest 14 12 10 6 2 B Male My Female M www A 2 0 Difference -2 -4 O This is a statistically significant result, p 0.05, fail to reject the null. O Both of the above. O No conclusions can be drawn about the NHST approach-this approach do not apply to paired designs.

I just need help with C-E If its helpful for A) I got 21 degrees of freedom and B) I got [-1.721, 1.721]

Consider the data. xi 3  12  6  20  14  yi 60 40 65 5 15   Use the t test to test the following hypotheses (? = 0.05): H0: ?1  =  0  Ha: ?1 ≠ 0 Find the value of the test statistic. (Round your answer to three decimal places.)   Use the F test to test the hypotheses in part (d) at a 0.05 level of significance. Present the results in the analysis of variance table format.

Before the furniture store began its ad campaign, it averaged 222 customers per day. The manager is investigating if the average is smaller since the ad came out. The data for the 14 randomly selected days since the ad campaign began is shown below. Round your mean and standard deviation to three decimal places when doing these calculations. 224, 211, 206, 206, 232, 189, 222, 197, 220, 210, 212, 213, 208, 189 Download CSV Assuming that the distribution is normal, what can be concluded at the a = 0.01 level of significance?

J sampled 1000 people, and determined whether they are a teacher or not and their gender. J found the information in the following table.   Is an Teacher Isn't an Teacher Male 42 449 Female 5 488 Other 1 15   Perform a chi-squared test of independence to test the null hypothesis that gender and status as an teacher are independent versus the alternative that they are dependent. What is the p-value for this test? What are the steps to come to this conclusion?