Using the z table find the critical value or values for an a

Using the z table, find the critical value (or values) for an a = 0.021 left - tailed test. A) -2.03 B) -2.31 C) -1.01 D) 1.15 A political strategist claims that 56% of voters in Madison County support his candidate. In a poll of 200 randomly selected voters, 100 of them support the strategist\'s candidate. At a = .05, is the political strategist\'s claim warranted? A) No, because the lest value -1.01 is in the noncritical region. B) No, because the tot value 2.22 is in the critical region C) Yes. because the test value -222 is in the noncritical region. D) Yes. because the tot value -1.71 is in the noncritical region. A statistician claims that the standard deviation of the weights of firemen is less than 25 pounds. A sample of 20 randomly chosen firemen had a standard deviation of their weights of 26.2 pounds. Assume the variable is normally distributed. At a = 0.05, what is the critical value t for this test? Ans When comparing the means of samples from two normally distributed populations, if the samples are independent and the population variances arc known, the test can be used. A) True B) False A marketing firm asked a random set of married and single men how much they were willing to spend on a vacation. Is there sufficient evidence at a = 0.05 to conclude that is there a difference in the two amounts? A) No, because the test value 0.23 is inside the critical region -1.96

Solution

Answer: (54) (A) True

Z-test is used to determine whether two population means are different when the variances are known and the sample size is large.

(58) (B) False

Range of the correlation coefficient is -1 to 1.

Note: It is the policy of chegg to answer one question at a time.