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Check your solutions from the practice.  Please be sure you fully understand all solutions before taking your exam. 




  1. a. The type of study is observational with the variable of interest being the age of the student.


  1.   (41.1,  50.9)


  1. a.  36 movies

b.  29 movies

c.  7 movies

d.  About 230 minutes

  1. Part a: Median 139,500   Mean: 163,125

Part b: Outlier 34,000  Median:  140,000 Mean: 181,571.429

Part c: outlier  434,000 Median:  139,000 Mean:  124428.57


  1. a. The goal is to determine how many teachers would choose a different career if given the opportunity.

b. All US teachers.

c. A Percentage of teachers who would choose a different career.

d. The 2150 teachers who were questioned.

e. Raw data is teacher responses (yes no) to question if they would choose a different career.

            f.  60% of teachers who said they would choose a different career.

            g. 55%-65%


  1. Red: (0.85,0.97)

Yellow: (0.86, 0.98)

Blue: (0.86,0.94)


  1. From stat disk

Source:     DF:  SS:      MS:       Test Stat, F:  Critical F:  P-Value: 

Treatment:  2    0.00224  0.00112   0.505269       6.112108     0.612123 

Error:      17   0.03769  0.002217                                        

Total:      19   0.03993                                                 


Fail to Reject the Null Hypothesis

There is not sufficient evidence to reject equality of means


The p value 0.61

We have sufficient evidence to claim the mean of all colors is the same.


  1. Expected probability of rolling a 2:  0.1667

Sample proportion:  .22

Difference 0.0533, this is not statistically significant (p = .31)


  1. Null hypothesis:  The mean of all three players are the same

Alternative hypothesis: the mean of at least one player is different

The p value is 0.036

At this level we must reject Ho and conclude at least one mean is statistically different.

  1. The minimum sample size is 364 students
  2.  a. 58%

b. 74%

c.  82%

d. 78%

  1. H0: p=0.095
    1. Ha: P<.095
    2. P hat= 0.0920
    3. Z=-0.33

d. No

    Test results from stat disk are as follows:

Claim:   p < p(hyp)


Available solutions