5% of all restaurants fail after one year. Is that number different_for chinese restaurants? Out of a random selection of 200 new Chinese estaurants, 175 had failed after one year. Use a 0.05 significance level to est your hypothesis. Vhat is the standard error? (round to the nearest thousandth)

A researcher wants to estimate the mean blood cholesterol level of young men ages 15-25 with a 90.16% confidence interval. The blood cholesterol level of young men follows a Normal distribution with standard deviation σ = 15 mg/dl. How large a sample would the researcher need to take to estimate the mean blood cholesterol to within 7 mg/dl? A sample of at least______people

Please solve for margin of error and sample proportion

A random sample of high school seniors were asked whether they were applying for college. The resulting confidence interval for the proportion of students applying for college is (0.65,0.69). What is the margin of error?

Harper's Index reported that 80% of all supermarket prices end in the digit 9 or 5. Suppose you check a random sample of 110 items in a supermarket and find that 84 have prices that end in 9 or 5. Does this indicate that fewer than 80% of the prices in the store end in the digits 9 or 5? Use ? = 0.05. -What is the value of the sample test statistic? (Round your answer to two decimal places.) -Find the P-value of the test statistic. (Round your answer to four decimal places.)

Hi how could you answer this question?

Fifty married couples attend a retreat. The ages of the wife and husband in each relationship is subtracted. Of interest is if people tend to marry others within 5 years of each other. The sample average difference was 12.1 years with a standard deviation of 3.4 years. If we conduct a hypothesis test, the distribution to use is   Group of answer choices   Normal Student-t with df = 49 Binomial Student-t with df = 25