Which of the following statement(s) about confidence intervals are correct? 1) There is no relationship between sample size and confidence interval's width 2) the smaller the sample size, the wider the confidence interval. 3) The higher the confidence level, The narrower the confidence interval. 4) The higher the confidence level, The wider the confidence interval. 5) The larger the sample size, The wider the confidence interval. 6) There is no relationship between confidence level and confidence interval's width.

If you are given that a 90% confidence interval for the mean turns out to be (1,350, 2,100). Give a definition of what it means to be “90% confident”. If you feel the answer is none of the choices given, submit no answer to the question. (A) In repeated sampling, the population parameter would fall in the given interval 90%of the time.(B) In repeated sampling, 90% of the intervals constructed would contain the populationmean.(C) 90% of the observations in the entire population fall in the given interval.(D) 90% of the observations in the sample fall in the given interval.

use among teenagers. In the first 95% confidence interval, the sample size was "A," and in the second 95% confidence interval, the sample size was "B." A smaller sample size for sample size "B" will cause the margin of error to decrease.   True False   ONLY If false, change the underlined portion by putting the correct answer here (leave blank if true):

7. A recent survey of 500 women indicated that 29% of women over age 55 in the study were widows. Construct a 90% confidence interval for the true proportion of women over the age of 55 who are widows based on this survey.