The length of time it takes college students to find a parking spot in the library parking lot ...

The length of time it takes college students to find a parking spot in the library parking lot follows a normal distribution
 
  with a mean of 5.5 minutes and a standard deviation of 1 minute. Find the probability that a randomly selected college student will take between 4.0 and 6.5 minutes to find a parking spot in the library lot.
  A) 0.0919 B) 0.4938 C) 0.7745 D) 0.2255

Q. 2

Test scores for a statistics class had a mean of 79 with a standard deviation of 4.5. Test scores for a calculus class had a mean of 69 with a standard deviation of 3.7.
 
  Suppose a student gets a 72 on the statistics test and a 86 on the calculus test. Calculate the z-score for each test. On which test did the student perform better relative to the other students in each class?

Q. 3

The college daily reported: 450 students living in university housing were polled. 270 said that they were satisfied with their living conditions. Based on this survey we conclude that 60 of students living in dormitories are satisfied.
 
  The margin of error of the study is  5 percentage points (with a 95 degree of confidence). Which statement is correct?
  A) The margin of error is consistent with the sample size.
  B) A larger sample should be used to achieve the stated margin of error.
  C) There is not enough information to determine whether the margin of error is consistent with the sample size.
  D) The stated margin of error could have been achieved with a smaller sample size.

Q. 4

A researcher finds that of 1000 people who regularly attend a religious service, 31 would stop to help a person with car trouble.
 
  Of 1200 people interviewed who do not regularly attend a religious service, 22 would stop to help a person with car trouble. At the 0.05 significance level, do the data provide sufficient evidence to conclude that those who regularly attend a religious service are more likely to stop and help a person with car trouble?

Q. 5

Determine the two z-scores that divide the area under the standard normal curve into a middle 0.96 area and two outside 0.02 areas.
 
  A) 0 and 2.05 B) -2.33 and 2.33 C) -2.05 and 2.05 D) -1.75 and 1.75

Q. 6

Determine the two z-scores that divide the area under the standard normal curve into a middle 0.874 area and two outside 0.063 areas.
 
  A) -1.39, 1.39 B) -1.53, 1.53 C) -1.46, 1.46 D) -1.45, 1.45