1. In finding a confidence interval for a population proportion or population mean, the margin of error depends on the sample size? T or F
2. For a confidence level of .90, what is the significance level?
3. How many degrees of freedom are there for a sample of size 38?

What is thepositive t-valuefor a confidence interval for the population mean with a sample size of 37 at a 98% confidence level?

Express with 3 decimals

Many cities are sending complaints that their manhole covers are defective.Sandbachian, Inc. is pretty sure that only 4% of their manhole covers are defective, but they would like to do a study, to confirm this number. They are hoping to construct a 95% confidence interval to get within 0.01 of the true proportion of defective manhole covers. How many manhole covers need to be tested?

Group of answer choices

What is the critical z-value for a 98% confidence level?

A sample of 35 students was taken from the local university. These students spent an average of $180 on books this semester, with a standard deviation of $22.50.Find a90% confidence interval for the average spent on books for all students

A random sample of married people were asked "Would you remarry your spouse if you

were given the opportunity for a second time?"Of the 150 people surveyed, 78% of them said that they would do so. Find a 90% confidence interval for the proportion of married people who would remarry their spouse.