22	What type of standard deviation is given in this problem?
A	DSM standard deviation
B	Sample standard deviation
C	Population standard deviation
D	Not enough information to determine
23	What is the value of the given standard deviation?
A	279
B	791
C	831
D	1997
24	What is the sample mean outcome?
A	423
B	831
C	791
D	1997
E	279

25	What is the DSM Standard deviation?
A	13.57
B	9.68
C	97.1
D	40.41
E	279
26	To determine the critical cutoff score what part of the textbook table should we use?
A	Normal Distribution with z scores for one tail test
B	Normal Distribution with z scores for two tail test
C	T Distribution with t scores for one tail test
D	T Distribution with t scores for two tail test
27	What is the value of the critical cut off z score? (Use = 5%)
A	-1.65
B	1.65
C	-2.33
D	2.33
E	1.96

28	What is the z values of the test statistic?
A	.99
B	-2.95
C	4.13
D	2.95
E	.41
29	Formally, `What is the final decision?
A	Do Not Reject Ho
B	Do Not Reject Ha
C	Reject Ho
D	Reject Ha
E	Neither reject nor Do not reject, since it is a tie.

30- 34	A sociology professor is interested in estimating the mean work hours that a student at his colleg works at a paying job. The Professor randomly selects 300 day students and calculates that the mean number of hours/week spent at a job is 18.5 hrs with s = 4.
30	What is the population being studied?
A	High school students
B	College students everywhere
C	College students attending the University where the Professor teaches
D	All young people between the ages of 16 and 22.
31	What is the population parameter being discussed above?
A	Amount of money college students make during a week.
B	The number of hours her is college students spend during the week at a paying job
C	The number of hours her college students have after working during the week.
D	What is the best paying job for college students.
32	What is the value of the best point estimate of the population parameter that the Professor is studying?
A	18.5 hrs/week
B	$185/week
C	Between 18.5 hrs/ week and 26.5 hrs / week
D	4 hrs / week
33	Using t scores what is the margin of error of a 95% Confidence interval.
A	0.33 hrs /wk
B	0.45 hrs/wk
C	0.52 hrs/wk
D	0.95 hrs/ wk
34	Form a 95% confidence interval for this parameter.
A	18.17 to 18.83
B	18.11 to 18.89
C	18.05 to 18.95
D	16.14 to 20.76

35- 37	A recent study claimed the average cholesterol level for all eighth grade students to be 190 with =30The school nurse feels that this number is too low. Choosing a random sample of 80 students, she finds their average cholesterol to be 197. Respond to the questions below.
35	What would be the Null Hypothesis?
A	= 80
B	> 80
C	= 197
D	=190
E	= 30

36	What is the Alternate Hypothesis	?
A	= 80
B	> 197
C	= 197
D	=190
E	> 190
37	What is the value of DSM standard deviation?
A	5.48
B	2.18
C	2.14
D	3.35

38- 40	A sociologist develops a test to measure attitudes about public transportation, and 27 randomly selected subjects are given the test. Their mean score is 76.2 and the standard deviation is 21.4
38		Using the given information above, construct a 95% confidence Interval for the mean
score of the population of all such subjects.
A	74.6 < u < 77.8
B	69.2 < u < 83.2
C	64;2 < u < 88.2
D	67.7 < u < 84.7

39	How should the sample size change to increase the precision of a confidence interval with a fixed confidence level?
A	Sample size should increase
B	Sample size should decrease
C	Sample size should stay the same
D	There is no relationship between the sample size and precision.
40	If we found Confidence Interval of 45.22 to 75.3 then what would be the Margin of Error?
A	60.25
B	15,03
C	30.08
D	15.04

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A researcher developed and tested a perception test on a group of 26 females and 22 males. Based on initial studies it seems males will score higher on her perception test. Each person in each group had to estimate the height of a horse at a distance of 15 feet. She assumed the population ofmales, Pop1, in general, and the population of females, Pop2, in general, were both normally distributed with unequal population standard deviations. Use = 5%. The sample results of her testing is displayed in the table below. Perception Study Results Table
	Male Pop1	Female Pop2
Sample Size	26	22
Sample Mean	32.3	26.5
Sample St. Dev.	28.7	22.8

41	What is the Null Hypothesis?
A	u1 -u2 = 0
B	u1 -u2=/= 0
C	u1 -u2> 0
D	u1 -u2 < 0

42	What isHa?
A	u1 -u2 =0
B	u1 -u2 =/= 0
C	u1 -u2> 0
D	u1 -u2< 0

43	Given the assumptions about the populations normality and their population standard deviations being unknown and unequal which hypothesis test procedure would be best to use?
A	Normal Distribution with z scores
B	The standard t distribution with t scores.
C	The pooled t -test
D	The Welch's t test.

44	For the statistic hypothesis testing procedure chosen in the previous question, how many degree of freedom should we use?
A	46
B	26
C	22
D	25
E	21
45	What is the value of mean of the sampling distribution of the differences between two means
A	u1 - u2 = 0
B	X1 - X2 = 0
C	: u1 - u2 = 5.8
D	X1 - X2 = 5.8
46	Using the statisticall hypothesis testing procedure chosen in an earlier question, find the value of the estimate of the standard error of the differences between two means.
A	5.91
B	26.17
C	7.44
D	22.8

47	Is this a one tail test or a two tail test and where is the Rejection region(s) on the graph of the distribution?
A	Two tail - both sides
B	One tail = right side
C	One tail left side
D	One tail in the Middle
48	What is/(are) the critical t score(s) to divide the Rejection region(s) from the Non Rejection Region?
A	1.72
B	2.08
C	2.83
D	2.52

49	Calculate the computed t score for the difference between the two sample means.
A	0
B	0.49
C	0.78
D	3.6
50	What is the final Conclusion for this hypothesis test?
A	Reject H0
B	Do Not reject H0