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Question 15 of 16

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Assume that a randomly selected subject is given a bone density test. Bone density test scores are normally distributed with a mean of 0 and a standard deviation of 1. Draw a graph and find P17, the 17th percentile. This Is the bone density score separating the bottom 17% from the top 83%.

Which graph represents P17? Choose the correct graph below.

O A.

О в.

O c

@

Q

O D.

@

P17

The bone density score corresponding to P17 is (Round to two decimal places as needed.)

P17

P

P47

ム

Use the accompanying radiation levels in  for 50 different cell phones. Find the percentile  

 = ___  (Type an integer or a decimal. Do not round.)

A study was done using a treatment group and a placebo group. The results are shown in the table. Assume that the taro samples are Independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.01 significance level for both parts.

a. Test the claim that the two samples are from populations with the same mean

What are the null and alternative hypotheses?

A.  

     

B.  

      

 

C.  

      

 

D.  

      

The test statistic, t, is ____. (Round to two decimal places as needed.)

The P-value is ____

(Round to three decimal places as needed.)

 The score on a mathematics college entry exam are normally distributed with a mean of 68 and a standard deviation of 7.2. Students scoring higher than one standard deviation above the mean will not be enrolled in the mathematics tutoring program. How many of the 750 incoming students can be expected to be enrolled in the tutoring program?