# The proportion of workers who get jobs through networking

Group number:
Student Names:
True or False
1. When carrying out a large sample test of , we fail to reject at level of significance when the calculated test statistic is more than critical value
2. When carrying out a large sample test of , by using a rejection point, we reject at level of significance when the calculated z-test statistic is less than
3. Type I error is the mistake of rejecting the null hypothesis when it is actually true.
4. The alternative hypothesis of the claim that cell phones have a mean radiation level less than 5 W/kg is expressed in symbol form as W/kg.
5. Assume that your plan to use a significance level of to test the claim that “The proportion of workers who get jobs through networking is at least 0.4” is right tail test.
6. The Student t distribution and the normal distribution are both symmetric
7. The F-test is used for comparing two population variances (T) (I will explain it in the upcoming class)
8. An online retailer claims that 90% of all orders are shipped within 12 hours of being received. A consumer group placed 121 orders of different sizes and at different times of day; 102 orders were shipped within 12 hours. The sample proportion ( ) of items shipped within 12 hours is 0.84
9. If 50 households were surveyed out of which 40 households have cable TV, the sample proportion of households with cable TV is 0.08.
10. With 0.05 significance level, , and the value of test statistics is z = 2.25, the P-value is equal to 0.0122. (Given that P(z < 2.25 = 0.9878))
11. When carrying out a large sample test of , by using a rejection point, we reject null hypothesis at level of significance if p-value = 0.35.
12. If the null hypothesis and alternative hypothesis are: . Then the P-value is the area on the left tail.
13. It is 90% (or 0.90) confidence level for corresponding value of = 0.20.
14. For a sample size of n = 32, the number of degree of freedom of student t-distribution is df = 31.
15. The F-distribution is not symmetric, it is skewed to the left. (F) (I will explain it in the upcoming class)
Multiple Choice Questions:
1. Area of rejection region depends on :
a) Size of
b) Size of
c) Test-statistic
d) None
2. The null hypothesis and the alternative hypothesis in the symbolic form for the claim:
“The proportion of workers who get jobs through networking is at least 0.7” are:
a)
b)
c)
d)
3. The F-distribution distributions is
a) Symmetric
b) Skewed to the right
c) Skewed to the left
d) Sometimes skewed, sometimes symmetric
4. Rejecting the null hypothesis by using the P-value method depends on comparing the p-value with
a) Value of
b) Value of
c) Value of the Test-statistic
d) Critical value
5. Assume that your plan to use a significance level of to test the claim that then the Pooled estimate with sample sizes ( ) and number of successes is ( ) is equal to
a) 0.4
b) 0.05
c) 0.5
d) 2
6. When carrying out a large sample test of by using a rejection
point, we reject at level of significance when the calculated test statistic is
a) Less than
b) Less than
c) Greater than
d) Greater than
7. Express the 95% confidence interval of in the form ,
a)
b)
c)
d) None
8. Express the null hypothesis and the alternative hypothesis in the symbolic form for the following claim:
“The average grade in the final examination of math is at most 80.” are:
a)
b)
c)
d)
9. Find the P-value if the z-test statistic of two tailed test for testing a claim is -1.35 (Given that P (z < -1.35) = 0.0885).
a) 0.8265
b) 0.0775
c) 0.1770
d) 1.3333
10. The claim is that more than 50% of workers are satisfied with their job and sample statistics include 400 employed adults, with 220 of them saying that they are satisfied with their job. The test statistic for the hypothesis test is (Here )
a) z = 40
b) z = 2
c) z = -2
d) z = 3
11. The degree of freedom of t-test for an unpaired samples with sample sizes
is equal to
a) 78
b) 74
c) 59
d) 39
(Hint unpaired samples means independent samples )

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