I have 10 questions I have answered all of them but I want to make sure that my answers are correct or not.

A point estimate is a single value used to estimate a population parameter. True or False True False A confidence interval for a population proportion uses the uniform distribution to approximate the binomial distribution. True or False True False Which of the following is a point estimate for the population mean ()? Multiple Choice O x . The mean length of a candy bar is 43 millimeters. There is concern that the settings of the machine cutting the bars have changed. Test the claim at the 0.02 level of significance that there has been no change in the mean length. The alternate hypothesis is that there has been a change. Twelve bars (n = 12) were selected at random and their lengths in millimeters recorded. The lengths (in millimeters) are 42, 39, 42, 45, 43, 40, 39, 41, 40, 42, 43, and 42. The mean of the sample is 41.5 and the standard deviation is 1.784. If the computed t= -2.913, has there been a statistically significant change in the mean length of the bars? Multiple Choice Yes, because the computed t lies in the rejection region. No, because the information given is not complete. o No, because the computed t lies in the area to the right of -2.718. Yes, because 43 is greater than 41.5. What is a Type Il error? Multiple Choice Failing to reject a false null hypothesis Rejecting a false null hypothesis a Accepting a false alternate hypothesis Rejecting a false alternate hypothesis If we are testing for the difference between two population means and assume that the two populations have equal but unknown standard deviations, the sample standard deviations are pooled to compute the best estimated variance. True or False True False For a hypothesis comparing two independent population means, Ho: M1 M2, what is the critical value for a one-tailed hypothesis test, using a 5% significance level, with both sample sizes equal to 13? Assume the population standard deviations are unknown but equal. Multiple Choice +1.711 +1.711 +2.060 +2.064 The F-distribution's curve is positively skewed. True or False True False In ANOVA analyses, when the null hypothesis is rejected, we can test for differences between treatment means by Multiple Choice constructing confidence intervals adding another treatment doing an additional ANOVA doing a t-test When testing for differences between treatment means, the degrees of freedom for the t-statistic are Multiple Choice k (n-1) (n-k) (1= n1+1=2)