Question

Home Insert Draw Design Layout References Mailings Review View Help Share РСо 25) the verbal SAT. Before taking the SAT for the second time, each student took a course to try to improve his or her verbal SAT scores. Test the claim at a=.05. List the a) null hypothesis b) average difference between the scores 3 4 5 6 2 456 7 432 308 332 443 306 471 Student Score on First SAT Score on Second SAT 421 524 400 421 348 589 391 26) In a crash test at five miles per hour, the mean bumper repair cost for 14 midsize cars was $547 with a standard deviation of $85. In a similar test of 23 small cars, the mean bumper repair cost was $347 with a standard deviation of $185. At a = 0.05, can you conclude that the mean bumper repair cost is the same for midsize cars and small cars? List the 26) p-value 27) accept or reject. 27) 28) 29). Last year the average daily change in the Dow Jones Industrial Index was 7.3 points. A random sample of 15 trading days this year showed the average change to be 5.6 points with standard deviation 10.2. Test the claim that the average change in the index is less this year than it was last year. 28) List the p-value 29) Have we proven that the change is significant? (yes or no) 30) what type of error could be made with the type of conclusion drawn from the results of this study? 30) 1039 words BE English (United States) O Focus DO

Answer 1

Question 25:

(a) The hypothesis being tested is:

H0: µd = 0

Ha: µd < 0

(b) Average difference = -52

First	Second	d
308	421	-113
456	542	-86
332	400	-68
443	421	22
306	348	-42
471	589	-118
432	391	41
	392.571	mean First
	444.571	mean Second
	-52.000	mean difference (First - Second)
	62.868	std. dev.
	23.762	std. error
	7	n
	6	df
	-2.188	t
	.0356	p-value (one-tailed, lower)

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