Statistics Practice

What shape is a normal distribution curve?

• Half curve
• Round curve
• Bell curve
• Square curve

According to the empirical rule, what percentage of data falls within 1 standard deviation? 

• 25%
• 68%
• 95%
• 99.7%

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

•  28,000 km and 32,000 km.
• 24,000 km and 34,000 km.
• 26,000 km and 34,000 km.
• 27,000 km and 31,000 km.

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 proportion of golfers that are between 30 and 46 years old.

• 68%

• 94%

• 95%

• 99.7%

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

• 68%

• 50%

• 95%

• 99.7%

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

• 68%

• 95%

• 50%

• 99.7%

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

• 68%

• 95%

• 99.7%

• 50%

Is the following a parameter or a statistic?

The average annual salary for 35 of a company's 1200 accountants is $68,000.

• parameter

• statistic

What is a number that describes of a sample?

• parameter

• statistic

• categorical variable

• numerical variable

What is the term in statistics for the entire collection or group of individuals being studied?

• population

• sample

• parameter

• statistic