statistics
posted by jeff .
Question 1
Question 1
1.
Question 1 text
The head of the History Department wants to compare the averages of 2 different instructorâ€™s to see if they differ. A sample of 15 students in Instructor Aâ€™s class has average of 74 with a standard deviation of 11. A sample of 12 students in Instructor Bâ€™s class has a mean of 77 and a standard deviation of 13. Variances are assumed to be equal. What is the test value?
Answer
Question 1 answers
0.65
0.64
0.62
0.63
Question 2
Question 2
1.
Question 2 text
A twotailed ttest independent samples is to be performed. The variances are assumed to be unequal. Group one has 17 people in the sample and group two has 14 people in the sample. If alpha = 0.05, what will be a correct critical value?
Answer
Question 2 answers
2.12
2.16
1.771
2.045
Question 3
Question 3
1.
Question 3 text
Which of the following would not be an example of dependent samples?
Answer
Question 3 answers
Students taking a pretest and a posttest on the same material
Patients are matched according to blood types in a hospital study
The salaries of truckers in Wyoming and compared to the salaries of truckers in Rhode Island.
The effect of a drug on reaction time measured by a before and after test.
Question 4
Question 4
1.
Question 4 text
Which of the following is not a requirement necessary to use the ztest in comparing two proportions?
Answer
Question 4 answers
the samples must be independent
Np must be 5 or more
Nq must be 5 or more
The samples must be dependent
Question 5
Question 5
1.
Question 5 text
The pooled estimate of the population variance for a given hypothesis test was 0.35. Sample 1 had 40 people out of 90 who liked poodles and sample 2 had 30 people who liked poodles. How many people were questioned in sample 2?
Answer
Question 5 answers
110
58
66
90
Question 6
Question 6
1.
Question 6 text
In a sample of 80 Honda cars, 45% of them got 28 miles per gallon,while a sample of 100 Nissan cars showed that 42% of them got 28 miles per gallon. If Honda cars are considered to be the first proportion,what would be the value of x1 ?
Answer
Question 6 answers
36
42
45
28
Question 7
Question 7
1.
Question 7 text
Using the ztest for comparing two independent means, sigma1 = 10, n1 = 32, sigma2 = 12 and n2 = 31, the standard error of difference would be:
Answer
Question 7 answers
7.77
2.79
0.7
0.836
Question 8
Question 8
1.
Question 8 text
A student was conducting a hypothesis test to compare 2 independent samples using the ztest. He is checking the claim that there is no difference between to different samples. Sample 1 had a mean of 85, a standard deviation of 14 and there were 36 items in he sample. Sample 2 had a standard deviation of 15 and there were 32 items in the sample. The student does not know what the mean of sample 2 was, but the test value was z= 1.85. What the mean of sample 2?
Answer
Question 8 answers
78.47
91.53
61.92
79.62
Question 9
Question 9
1.
Question 9 text
A hypothesis test will be performed to test the difference between means when the 2 samples are independent. Which test will be used when the population standard deviations are not known?
Answer
Question 9 answers
ztest
ttest
test of proportions
chisquare test
Question 10
Question 10
1.
Question 10 text
The ttest for independent samples when the variances are equal will be used to compare 2 means. One sample is size 12, the other sample is size 10. A twotailed test will be performed using Alpha = 0.02. What would be a correct critical value for this test?
Answer
Question 10 answers
2.518
2.718
2.821
2.528

It seems like you are trying to get us to do your work for you. We do not do that. If we did, you would learn very little.
Show us your attempts to respond to these questions, so we can give you feedback.
Respond to this Question
Similar Questions

statistics
The head of a computer science department is interested in estimating the proportion of students entering the department who will choose the new computer engineering option. A preliminary sample indicates that the proportion will be … 
English
1. What's your favorite class? 2. It's math. 3. It's math class. 4. It's a math class. 5. My favorite class is math. Which are the right answers for the question? 
statistics
14) You wish to compare the average GPA of students from one department to another. It is assumed that the distributions of GPA in both departments are normally distributed and that the overall standard deviation of GPA is the same … 
Math
Can someone please help me with these three question? 
Math 126
These are the automatically computed results of your exam. Grades for essay questions, and comments from your instructor, are in the "Details" section below. Date Taken: 7/15/2012 Time Spent: h , min , 19 secs Points Received: 18 / … 
Statistics
Your mathematics instructor claims that, over the years, 88% of his students have said that math is their favorite subject. In this year's class, however, only 21 out of 32 students named math as their favorite class. The instructor … 
AP Statistics
Your mathematics instructor claims that, over the years, 88% of his students have said that math is their favorite subject. In this year's class, however, only 21 out of 32 students named math as their favorite class. The instructor … 
statistics
1. I took a sample of the grade point averages for students in my class. For 25 students, the standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was: 
Statistics
A history class is comprised of 5 female and 8 male students. If the instructor of the class randomly chooses 8 students from the class for an oral exam, what is the probability that 2 female students and 6 male students will be selected? 
English
There are three teams in a classroom. 1. This question is for Team 1. 2. Only Team 2 can answer this question. 22. Only students in Team 2 can answer this question. (Do we have to put 'the' before 'students'?