Blog

An outlier can have a dramatic effect on the and the .

Bill Gates moves into your neighborhood. The US CENSUS comes and determines that the mean (average) income in your neighborhood is $1 million dollars a week. Which measure of center would you recommend to use and why

Match each prefix to the correct definition or description.

A previous national opinion poll found that 44% of all US adults agree that parents should be given vouchers that can be applied toward their children’s education at any public or private school of their choice. Find the minimum sample size that would be needed if you would like to construct a 99% confidence interval. Your estimate must be accurate within 3% of the population proportion.

Watch each prefix to the correct definition or description.

A random sample of 500 Douglas fir trees has a mean height of 112.3 ft. Construct and interpret a 90% confidence interval for the mean height of Douglas fir trees. Assume

A previous national opinion poll found that 44% of all US adults agree that parents should be given vouchers that can be applied toward their children’s education at any public or private school of their choice. Find the minimum sample size that would be needed if you would like to construct a 99% confidence interval. Your estimate must be accurate within 3% of the population proportion.

A researcher wants to estimate the average amount of sleep college students get per night within 15 minutes (0.25 hour) of the population mean. What is the minimum sample size they would need to build a 95% confidence interval? Assume

In this distance learning class, what was intended to take the place of classroom discussions?

A manufacturer of tablet computers claims that their average battery life while watching videos is at least 11.5 hours. A random sample of 20 tablets are taken and they have a mean battery life while watching videos of 11.07 hours with a standard deviation of 1.097 hours. Assume battery life while watching videos is normally distributed. Write the null and alternative hypothesis for this hypothesis test. Check that the appropriate conditions are met and calculate the appropriate standardized test statistic. Assume the p-value is 0.0479 and