Q:1-A high school calculus exam is administered to a group of students. Upon grading the exam, it was found that the mean score was 95 with a standard deviation of 12. If one student's z score is 1.10, what is the score that she received on her test?
Mark one answer:
109.2
108.2
105.3
110.1

Q:6-The average score on the statistics final exam was 85 and the standard deviation was 2.5. Chris scored a 95. Chris scored higher than what percent of his class?
Mark one answer:
95.7
96
4
.9999

Q:7-A sample consists of the following observations:(2,8,5,7,2). What is the mean?
Mark one answer:
4.8
8.4
2
5

Q:8-A health insurance executive suspects that 50% of the Affordable Care Act applications are incomplete (i.e. critical data is missing from the application). He wants to gather a sample to estimate the true proportion. He wants to be within 5% of the true mean with 95% confidence.
What sample size does he need?
Mark one answer:
405
365
395
385

Q:9-Suppose you have a normally distributed variable with known variance. How many standard errors do you need to add and subtract from the sample mean so that you obtain 95% confidence intervals?
Mark one answer:
1.645
1.96
1.99
1.98

Q:10-You estimate a regression model with B=3.4 and SE=.024, where B is the beta coefficient and SE is the standard error. Construct 95% confidence intervals for B.
Mark one answer:
[3.4,3.45]
[3.35,3.45]
[3.1,3.45]
[3.2,3.65]