A survey of 1000 patients at Emory hospital found that 40% cases are heart disease treatment.  Identify the sample.

A TV report show that Chelsea soccer club won 11 of 34 games last year.

Identify the sample

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A teacher splits her classes up by period. She then randomly picks 3 students from each period to do a survey.

What type of Sampling?

You are interested in finding out the percent of residents in the city that have experienced a robbery in the past year. Using the city property records, you assign each residence a number. You use a random number generator to give you a list of numbers. You contact the residence that corresponds to that number to ask your questions.

What type of Sampling?

You want to know the average number of hours that high school seniors spend playing video games in your state. You randomly select 20 high schools in the state and then ask all the seniors at each of the 20 high schools about their video game habits.

This data is normally distributed. What percent of the data is in the shaded region?

Use the following information and the Empirical Rule to estimate the answer.

The ages of golfers are normally distributed, with a mean of 38 and a standard deviation of 4.

Find the percentage of golfers that are between 30 and 46 years old.

The ages of the population of people living in the Atlanta area are normally distributed with a mean of 43 and a standard deviation of 14.

The town has a population of 5,000. How many would you expect to be aged between 29 and 57?

This Standard Normal Distribution curve may help you solve this problem.

Find the z-score

x = 36 μ= 42 σ = 5

Adam's Z-score on a test is +2.50. What does this mean?

On the same test, your best friend got a 76. (Mean = 80, SD = 8)

What's her Z-score?

A sample of 121 high school seniors were surveyed on their level of school spirit on a scale of 0-100. The sample mean of this survey is 86. The known population standard deviation is 14 for all seniors in the class. Which of these is a 95% confidence interval for the population mean?

For a class project, a student in a statistics class surveys the monthly rent for 32 unfurnished one-bedroom apartments in Boston and finds the mean monthly rent to be $1400 with a standard deviation of $220.

Find the margin of error for the sample mean. (assuming 95% confidence) Round to the nearest hundredth

A data set has a mean of 290 and a standard deviation of 20. Calculate the z-score for 265.