In Exercises 5–20, assume that the two samples are independent simple random samples selected from
20. Blanking Out on Tests Many students have had the unpleasant experience of panicking on a test because the first question was exceptionally difficult. The arrangement of test items was studied for its effect on anxiety. The following scores are measures of “debilitating test anxiety.” which most of us call panic or blanking out (based on data from “Item Arrangement, Cognitive Entry Characteristics. Sex and Test Anxiety as Predictors of Achievement in Examination Performance,” by Klimko, Journal of Experimental Education, Vol. 52, No. 4.) Is there sufficient evidence to support the claim that the two populations of scores have different means? Is there sufficient evidence to support the claim that the arrangement of the test items has an effect on the score? Is the conclusion affected by whether the significance level is 0.05 or 0.01?
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ELEMENTARY STATS. 18 WEEK ACCESS CODE
- Final Conclusions. In Exercises 25–28, use a significance level of α = 0.05 and use the given information for the following: a. State a conclusion about the null hypothesis. (Reject H0 or fail to reject H0) b. Without using technical terms or symbols, state a final conclusion that addresses the original claim. Original claim: The standard deviation of pulse rates of adult males is more than 11 bpm. The hypothesis test results in a p-value of 0.3045.arrow_forwardplease solve question 21 and 23arrow_forward- test the null hypothesis that the population mean, u is 14.arrow_forward
- Let x be a random variable that represents blood glucose level after a 12-hour fast. Let y be a random variable representing blood glucose level 1 hour after drinking sugar water (after the 12-hour fast). Units are in milligrams per 10 milliliters (mg/10 ml). A random sample of eight adults gave the following information. I need help with Part A, B, and Carrow_forwardpart 1 of 2 If you are a 65% free-throw shooter and the random variable Y denotes the total number of shots in order to make one free-throw, then: Calculate E[Y]. Round to the nearest whole number. part 2 of 2 Calculate Var[Y]. Round to the nearest whole number. 1.4 2.1 3.2 4. 3 1.2 2.1 3.0 4. 3arrow_forwardPart I [15 poins]: 1. Suppose you were to explain to a person who has not yet studied statistics that a statistical test has just resulted in the rejection of the null hypothesis that a population mean u is equal to 0. That is, H:H = 0. has been rejected, say, at the 5 percent level of significance. Which of the following is a more accurate statement? (a) The evidence of the data indicated that the population mean differs significantly from 0. (b) The evidence of the data was significant enough to indicate that the population mean differs from 0.arrow_forward
- Answer the question. All information is available. a=6.5arrow_forwardSection Exercise 9-33 (Static) Find the p-value using Excel (not Appendix D): (Round your answers to 4 decimal places.) p-value (a) Right-tailed test (b) Two-tailed test (c) Left-tailed test t = 1.457, d.f, = 14 t = 2.601, d.f. = 8 t=-1.847, d.f. = 22arrow_forwardJust Part A and Barrow_forward
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