Question

Question 3 4 pts The engineering school at a major university dalms that 20% of its graduates are women. In a graduating class of 210 students, 58 were females. Does this suggest that the school is believable? Useo-005. The test statistic was calculated at 2.76, and the p-value is 0.0058. What decision and condusion can you make? O Reject the ruli hypothesis there is sufficent evidence to conclude that the percentage is not 20%. silto reject the nell hypothesis, there is sufficent evidence to conclude that the percentage is not 20% Reject the ruli hypothesis there is sufficent evidence to conclude that the percentage is 20% Fail to reject the null hypothesis, there is suthcent evidence to conclude that the percentages 20% Question 4 1 pts A poil of 1068 adult Americans reveals that 48% of the voters Surveyed prefer the Democratic candidate for the presidency. At the 0.05 level of significance, test the daim that at least half of all voters prefer the Democrat. The test statistic was calculated to be 1.31 and the p-value is 0.0951. What decision and conclusion can you make Fall to reject the nuli hypothesis there is sufficent evidence to say the true percentage of Democrats is more than Fail to reject the null hypothesis, there is not sufficent evidence to say the true percentage of Dentoris more than 50% Reject the multpothesis, there is sufficent evidence to say the true percentage of Democrats is more than 50% Reject the null hypothesis there is not suricentevidence to say the true percentage of Democrats is more than 10 4 pts Question 5 A report stated that for a female college students, the mean weight is given by - 132 lb. A researcher wants to know if his campus has a different mearA sample of 20 female students has a mean of 137 lbs, and standard deviation of 14.2 lbs. Calculate the test statistic -0.070 0157 0.-157

Answer 1

a) Correct option "A"

Reject the null hypothesis there is sufficient evidence to conclude that the percentage is not 20%

Explanation: p-value is less than alpha value

b) Correct option "B"

Fail to reject the null hypothsis there is not sufficeint evidence to say the true percentage of demonstrate is more than 50%

Explanation: p-vlaue is greater than alpha value

c) Correct option "B" 1.57

Here we have: X = 137 S = 14.2 n = 20 Hypothesis: Ho; u = 132 Hai ul # 132 Test statistics: t-distribution (o unknown) χ-μ t = 137-132 14.2 20 = 1.57 S in