• You wish to test the null hypothesis H0: p = 0.55 using a sample with sample proportion = 0.7 and n = 38. What is the value of the test statistic? ( 2 decimal places)

NB: the sample proportion has standard error

SQRT p(1-p)/n

p.s. I got the answer of 0.0649, but the answer was wrong. I don't know how to solve this question.. please help. Appreciate

• A sample of n = 15 observations yields a test statistic of -2.28. The test statistic has a t-distribution with n-1 degrees of freedom, and the alternative hypothesis is two- tailed. What is the associated p-value for this test? ( 3 decimal places)

p.s. I got the answer of 0.019 but the answer was still wrong...

• A random sample of chief executives contains 8 with salaries over $1,000,000 and 21 with salaries below $1,000,000. What is the sample proportion of chief executives with salary below $1,000,000? ( 2 decimal places)

p.s. My answer was 0.28 but it was wrong...