Q1) To evaluate average annual expenses of students on books and class materials sample size 36 is taken.  Average is $850 and standard deviation is $54. A 99% confidence interval for he population mean is:

a) $823.72 to $876.28 

b) $832.36 to $867.64 

c) $826.82 to $873.18 

d) $825 to $874.52

Q2) Random sample of 16 ATM transactions at Last National Bank of Flatrock revealed a mean transaction time of 2.8 minutes with standard deviation of 1.2 minutes. Width (in minutes) of 95% confidence interval for true transaction time is:

a) +or-0.639 

b) +or-0.588 

c) +or-0.300  

d) +or-2.131

Q3) Study of effectiveness of two sea sickness prevention medicines of people who would normally experience sickness had following results in rough seas on a 3 hour cruise about SS Minniw:

Product A: 145 people out of 210 felt no sea sickness symptoms

Product B:135 people out of 180 felt no sea sickness symptoms

Test claim that there is no difference between effectiveness of product A and B using significance level of 0.1 Create distribution curve and show values

Ho :   ...................   P-value=....................

H? :......................... Test stat =.................

CV=.................(critical value)