Can you please check if I did right?

You flip a coin 100 times. 43 times it comes up heads. To determine whether this is a "fair" coin, you can perform which type of test on these data? a) Two variable chi square test O b) Repeated measures t-test O c) One variable chi square test O d) One-sample t-test O e) None of the above Question 20 1 pts Which of the following is true about the relationship between the widths of 95% and 99% confidence intervals calculated for the same data set? ( a) a 99% confidence interval will be narrower than a 95% confidence interval b) a 99% confidence interval will be wider than a 95% confidence interval O c) the widths of the 99% and 95% confidence intervals depend on the mean of the sample ( d) 99% or 95% confidence intervals always have equal widths if the standard error is equal Question 21 1 pts The sample correlation coefficient: ( a) can't be tested inferentially: it is purely a descriptive statistic ( b) by converting r to t and can be tested inferentially by conducting a t-test O c) can be accurately estimated by visual inspection of a scatterplot d) none of the above Question 22 1 pts If you want to estimate mean longevity (life span) of people living in the country "Lyv-long-nd- prosper," you would, a) conduct a z-test O b) conduct a t-test ( c) calculate a confidence interval O d) take a census Question 23 1 pts If you want to determine whether a supposed intelligence enhancing drug works on UCSD students, then among the inferential techniques learned in this class you would be advised to conduct a(n): al Z-test O b) one sample t-test O c) two independent samples t-test d) estimation procedure