Loading... Please wait...

- Home
- Solution Library
- Statistics
- 1)A political strategist claims that 58% of v

1)A political strategist claims that 58% of voters in Madison County support his candidate. In a poll of 500 randomly selected voters, 260 of them support the strategist's candidate. At = .05, is the political strategist's claim warranted?
a. Yes, because the test value 1.60 is in the critical region.
b. Yes, because the test value 3.53 is in the noncritical region.
c. No, because the test value 3.53 is in the critical region.
d. No, because the test value 2.72 is in the critical region.
2)An educational researcher is analyzing the test scores for physics students taught using two different methods - a traditional method, and a web-based self-paced method. Can he conclude, at = .05, that the test scores in the web-based self-paced method are lower?
Traditional Web-based Self-paced
Sample size 50 40
Mean test score 80 76
Population variance 26 42
a. The data does not support the claim because the test value 1.27 is less than than the critical value 1.65.
b. The data does not support the claim because the test value 1.27 is less than than the critical value 1.96.
c. The data supports the claim because the test value 3.19 is greater than than the critical value 1.96.
d. The data supports the claim because the test value 3.19 is greater than than the critical value 1.65.
3) A group of college students believes the average grades in psychology courses are different than the average grades in biology courses. The group found the average psychology grades of a sample of 11 students was 84.4 and the average biology grades of a sample of 11 students was 78.2. What is the null hypothesis for this study?
4)A reporter bought hamburgers at randomly selected stores of two different restaurant chains, and had the number of Calories in each hamburger measured. Can the reporter conclude, at = 0.05, that the hamburgers from the two chains have a different number of Calories?
Chain A Chain B
Sample size 5 9
Sample mean 230 Cal 285 Cal
Sample standard deviation 23 Cal 29 Cal
a)No, because the test value 0.28 is inside the noncritical region
b)Yes, because the test value 0.28 is inside the noncritical region
c)Yes, because the test value 3.90 is outside the noncritical region
d)No, because the test value 1.26 is inside the noncritical region
5) A running coach wanted to see whether runners ran faster after eating spaghetti the night before. A group of six runners was randomly chosen for this study. Each ran a 5 kilometer race after having a normal dinner the night before, and then a week later, reran the same race after having a spaghetti dinner the night before. The times for their races are shown in the table below. What test value should be used in a t test for these dependent samples?
Run 1 Run 2 Run 3 Run 4 Run 5 Run 6
Regular Dinner 1000 s 985 s 1009 s 970 s 1016 s 996 s
Spaghetti Dinner 992 s 979 s 1005 s 968 s 1016 s 998 s
a)3.80
b)0.80
c)1.55
d)1.96
6)Two groups were polled about their attitudes towards capital punishment. In one group 30 out of 100 favored capital punishment, and in the other group 40 out of 80 favored capital punishment. Calculate an appropriate test value to test the hypothesis that the population proportions are the same.
a)2.73
b)37.40
c)0.20
d)13.68
7)For the samples summarized below, test the hypothesis, at ± = 0.05, that the two variances are different.
Sample 1 Sample 2
Sample Std. Deviaiton 4.3 2.8
Sample size 10 20
a)Reject the hypothesis because the test value 2.36 is less than the critical value 2.88.
b)Reject the hypothesis because the test value 2.36 is less than the critical value 2.35.
c)Accept the hypothesis because the test value 5.56 is greater than the critical value 2.77.
d)Reject the hypothesis because the test value 5.56 is greater than the critical value 2.42.
8)Ten pairs of points yielded a correlation coefficient of 0.790. If , which of the following statements is correct if ? (Do not calculate a t-value.)
A) Because 0.790 is greater than 0.632, the null hypothesis is not rejected.
B) Because 0.790 is greater than 0.632, the null hypothesis is rejected.
C) Because 0.790 is greater than 0.602, the null hypothesis is not rejected.
D) There is no correlation between the variables.
Not Complete Question
9)A study was conducted to determine if there was a relationship between the prices a non-member of a book club paid for various publications and the prices that a member paid for the same publications. The data gathered is shown below. Compute the value of the correlation coefficient.
Non-member Price Member Price
58 32
42 22
46 20
32 16
25 19
75 58
35 34
63 48
a)0.762
b)0.857
c)0.679
d)0.932
10)The equation of a regression line is . What is the intercept of this line?
A) 4.6
B) 3.2
C) 4.6
D) 0
11)If the equation for the regression line is y' = 6x 8, then a value of x = 4 will result in a predicted value for y of
A) 14
B) 38
C) 32
D) 16
12) The following data list ages of cars (in years) and monthly repair cost in dollars. What is the standard error of the estimate?
Age Cost
3 25
5 35
7 55
9 50
11 75
14 85
A) 6.36
B) 7.34
C) 8.75
D) 5.49

Expert's Answer

Download Solution:

This solution includes:

- Plain text
- Cited sources when necessary
- Attached file(s)
- Solution Document(s)

- Company
- About Us
- Blog
- Press
- Careers
- Contact Us

Subjects

Accounting | Anatomy | Anthropology | Art and Architecture | Astronomy | Auditing | Biochemistry | Biology | Business Law | Business Management | Business Studies | Chemistry | Economics | English | Earth Science | Computer Science | Essay Writing | Finance | Gender Studies | Hospitality Management | HR Management | Humanities | Law | Management | Marketing | Math | Mathematics | Mechanical Engineering | Medical Science | Nursing | Operations Management | Other Engineering | Other Subjects | Philosophy | Physics | Physiology | Political science | Psychology | Sociology | Statistics | Taxation | Web Development | Writing Assignments