Find the necessary sample size.

Find how large a sample must be drawn in order to be 95% confident (use z=2) that the sample mean will not differ from the population mean by more than 1.30 kg.

A random sample of 27 adults had a sample mean height of 168 cms with a sample standard deviation of 10 cms. The standard error (from the standard deviation of the sampling distribution) of the sample mean height, correct to one decimal place, is

To calculate a 90% confidence interval for a mean, from a sample of 26 data values, the required t-value for the multiplier would be

Use the given sample data to construct the indicated confidence interval for the population mean.

Based on a sample of 30 randomly selected years, a 90% confidence interval for the mean annual precipitation in one city is

from 123.7 cm to 129.5 cm

Determine the margin of error involved in this confidence interval.

To calculate a 95% confidence interval for a mean, using a sample of 10 data values, the required t-multiplier, correct to 3 decimal places, would be

Which of the following statements is the most accurate interpretation of the following confidence interval.

Find the percent of a standard Normal model found in the given region: