Project #5924 - Statistics

1. A study of 36 students finds that the average number of hours per week a student studies is 10 with a standard deviation of 3. Calculate the 90% confidence interval for the true average number of hours per week a student studies.  Use the exact values until the final step, in which you then round.  But, for the purpose of each answer box, please round each answer to the ten-thousandths.

Critical value 
Error  
Lower Limit of Confidence Interval 
Upper Limit of Confidence Interval 
   

2. A previous study of nickels showed that the standard deviation of the weight of nickels is 200 milligrams.  A coin counter manufacturer wishes to find the 90% confidence interval for the average weight of a nickel.  How many nickels does he need to weigh to be accurate within 25 milligrams?

3. The following data set represents a sample of the total points scored by an NBA player during the season.  Calculate the 80% confidence interval for the average number of points scored by an NBA player.  State the following intermediate steps.    

Use the exact values until the final step, in which you then round.  But, for the purpose of each answer box, please round each answer to the ten-thousandths.

9,26,12,26,11,25,17,23,13,27,24,30,19,3,34,22,16,12,29,30

a) Calculate the mean of this data set.

b) Calculate the standard deviation.

c) Calculate the critical value (either z or t).

c) Calculate the error. 

d) Calculate the confidence interval (upper and lower limit).

<mean<

4. A study of 90 teenage girls revealed that 60 of them regularly text while driving. (Shame on them)!  Construct a 95% confidence interval for the true proportion of girls who text while driving.  Use the exact values until the final step, in which you then round.  But, for the purpose of each answer box, please round each answer to the ten-thousandths.

phat  
qhat  
critical value 
error  
Lower Limit of Confidence Interval 
Upper Limit of Confidence Interval 

Subject Mathematics
Due By (Pacific Time) 05/09/2013 10:30 pm
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