Statistics Final Review

1.|Using the z-table (Table E), find the critical value (or values) for a = .08 two-tailed test.|
|A) 1.4051 B) 1.7507 C) 1.4051 D) 1.7507|

2.|A report states that 38% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 5% with 90% confidence?|
|A) 64 B) 128 C) 255 D) 510|

3.|If the equation for the regression line is y = –8x + 5, then the intercept of this line is|
|A) 10 B) 5 C) –3 D) –8|

4.|For the samples summarized below, test the hypothesis at =.05 that the two variances are equal.|Variance|Number of data values|Sample 1|25|7|Sample 2|9|17||
A)|Accept the hypothesis because the test value 7.72 is greater than the critical value 3.34.|
B)|Reject the hypothesis because the test value 2.78 is less than the critical value 3.16.|
C)|Reject the hypothesis because the test value 7.72 is greater than the critical value 3.16.|
D)|Accept the hypothesis because the test value 2.78 is less than the critical value 3.34.|

5.|For the conjecture "The average age of students in this class is 23", the null hypothesis is:|
A)|We accept the hypothesis that the average age of students in this class is 23|
B)|The average age of students in this class is 23|
C)|The average age of students in this class is not 23|
D)|We reject the hypothesis that he average age of students in this class is 23|

6.|Compute the correlation coefficient for the data belowX values|–3|1|2|Y values|6|4|–3||
|A) 0.760 B) –0.280 C) –0.400 D) –0.800|

7.|Find and when =10, =50, =25, and =80|
A)| = 0.27 and = 0.73|C)| = 1.37 and = 3.71|
B)| = 3.71 and = 1.37|D)| = 0.73 and = 0.27|

8.|If a population has standard deviation 10, what is the minimum sample size to be 95% confident that the error