Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false. ? ? A V A V {D o 1. If a sample has 15 observations and a 90% confidence estimate for y is needed, the appropriate t-score is 1.341. 2. If a sample has 18 observations and a 90% confidence estimate for [4 is needed. the appropriate t-score is 1.740. 3. If a sample of size 250 is selected, the value ofA for the probability P(A 5 t 5 A) = 0.90 is 1.651. 4. If a sample of size 30 is selected. the valueA for the probability P(A S t S A) = 0.95 is 2.045. (9 points) From previous studies, it has been generally believed that Northern Hemisphere icebergs have a mean depth of 270 meters. An environmentalist has suggested that global warming has caused icebergs to have greater deptht A team of scientists visiting the Northem Hemisphere observed a random sample of 41 icebergs. The depth of the base of the iceberg below the surface was carefully measured for each. The sample mean and standard deviation were calculated to be 276 meters and 20 meters respectively. Part a) What is the parameter of interest relevant to this hypothesis test? A. 41 B. 270 meters C. The mean depth (in m) of all Northern Hemisphere icebergs. D. The mean depth (in m) of the 41 icebergs in the study. E. None of the above Part b) In testing a hypothesis about a parameter of interest, what would your null hypothesis be? The mean depth of the Northern Hemisphere icebergs is 270 meters now. The mean depth of the Northern Hemisphere icebergs is greater than 270 meters now. The mean depth of the Northern Hemisphere icebergs is smaller than 270 meters now. The mean depth of the Northern Hemisphere icebergs is different from 270 meters now. The mean depth of the Northern Hemisphere icebergs used to be 270 meters. The mean depth of the Northern Hemisphere icebergs used to be greater than 270 meters. The mean depth of the Northern Hemisphere icebergs used to be smaller than 270 meters. The mean depth of the Northern Hemisphere icebergs used to be different from 270 meters. Part G) You would take the alternative hypothesis to be: one-sided, right-tailed. two-sided. one-sided, left-tailed it does not matter whether we take a one-sided or two-sided altemative. Part d) Compute the test statistic (Please round your answer to three decimal places): Part e) Assume all necessary conditions are met (random sampling, independence samples, large enough sample size). Which of the following approximate the sampling distribution of the test statistic in Part d: Non'nal distribution tdistribution Part0 Which of the following ranges the P-value must lie in? [You will need the t-table to answer this question] A. 41.005 B. 005-001 C. 0.01 -0.025 D. 0.025-0.05 E. 0.050.1 0 F. >0.10 Part 9) Based on the P -value that was obtained, you would (Select all that apply): A. neither reject nor accept the null hypothesis. B. reject the null hypothesis at a = 0.1 level of significance C. reject the null hypothesis at a = .05 level of significance D. fail to reject the null hypothesis at all. E. believe the null hypothesis is true. F. None of the above Part h) Suppose that, based on data collected, you reject the null hypothesis. Which of the following could you conclude? There is sufficient evidence to suggest that the mean depth of Northern Hemisphere icebergs has increased due to global warming. There is sufficient evidence to suggest that the mean depth of the Northern Hemisphere icebergs has not changed. There is suffic' nt evidence to suggest that the mean depth of Northern Hemisphere icebergs has decreased due to global warming. There is insuff nt evidence to suggest that the mean depth of the Northern Hemisphere icebergs has not changed. There is insufficient evidence to suggest that the mean depth of Northern Hemisphere icebergs has increased due to global warming. There is insufficient evidence to suggest that the mean depth of Northern Hemisphere icebergs has decreased due to global warming. Pam) Suppose that, based on data collected, you decide that the mean depth of Northern Hemisphere icebergs has increased due to global warming. it is possible that you are making a Type I error. it is possible that you are making a Type II error. it is certainly correct that the mean depth of Northern Hemisphere icebergs has increased due to global warming. it is certainly incorrect that the mean depth of Northern Hemisphere icebergs has increased due to global warming. "there must l'lVB been a problem with the Way the sample was obtained. (3 points) Suppose you have selected a random sample of n = 15 measurements from a normal distribution. Compare the standard normal z values with the corresponding : values if you were forming the following confidence intervals. (a) 99% confidence interval t = (b) 95% confidence interval Z= t = (c) 90% confidence interval Z = 1 =The observations from a random sample of n = 6 from a normal population are: 12.63,11.4,13.41,12.15,12.4,12.91. Test the null hypothesis of H0 : p = 13 against the alternative hypothesis of H1 2 [4