1a) Find the critical value for an 80% confidence interval.

A) 1.28 or -1.28 B) 1.645 or -1.645 C) 1.32 or -1.32 D) 1.18 or -1.18 E) 3.14 or -3.14

b) Suppose we have a right-tailed test and the value of the test statistic is found to be = 1.4. What is the p-value associated with this test statistic? (I don't understand how this value is found in the t Table, please explain)

A) 0.92 B) 0.63 C) 0.08 D) 0.12 E) 0.03

c) - Find the critical value for a left-tailed test with = 0.05.

A) 1.645 B) 2.88 C) 1.28 D) -1.645 E) -1.69 (I don't understand how this value is found in the t Table, please explain)

d) In a random sample of 200 customers, 112 sample members expressed interest in purchasing a new product being developed by a company. We would like to conduct a hypothesis test with 5% significance level to determine if the proportion of customers who would consider buying the product is higher than 0.5. What is the value of ?

A) Approximately 52% B) Approximately 55% C) Approximately 58% D) Approximately 45% E) Approximately 42%