Statistics Study Quiz

The speed in miles per hour of each of Sam's last ten pitches were recorded as follows:

{82, 78, 83, 80, 75, 82, 79, 80, 83, 81}.

Find the mean, median, variance and standard deviation.

Round your answers to the nearest hundredth.

• mean: 80.3;

  median: 80.5;

  Variance: 2.37;

  Standard deviation: 5.62

• mean: 80.3;

  median: 81;

  Variance: 2.73;

  Standard deviation: 7.45

• mean: 80.3;

  median: 80.5;

  Variance: 5.62;

  Standard deviation: 2.37

• mean: 80.3;

  median: 81;

  Variance: 7.45;

  Standard deviation: 2.73

On your own paper, sketch a bell curve with normal distribution. You will turn this in at the end of the test. Use it to answer the following questions.

The number of days a group of 250 homes in on the market is normally distributed with a mean of 50 and a standard deviation of 13.

What percent of the homes are on the market between 11 and 89 days?

• 95%

• 68%

• 99.7%

• 85%

Tags

CCSS.HSS.ID.A.4

On your own paper, sketch a bell curve with normal distribution. You will turn this in at the end of the test. Use it to answer the following questions.

The number of days a group of 250 homes in on the market is normally distributed with a mean of 50 and a standard deviation of 13.

What percentage of homes are on the market for at least 37 days?

• 84%

• 16%

• 50%

• 68%

Tags

CCSS.HSS.ID.A.4

Using the same information: The number of days a group of 250 homes in on the market is normally distributed with a mean of 50 and a standard deviation of 13.

Approximately how many homes were on the market between 37 and 63 days?

• 170

• 68%

• 95%

• 125

Tags

CCSS.HSS.ID.A.4

Using the same information: The number of days a group of 250 homes in on the market is normally distributed with a mean of 50 and a standard deviation of 13.

Approximately how many homes were on the market for no more than 24 days?

• 4

• 6

• 68%

• 2.5%

Tags

CCSS.HSS.ID.A.4

Which two of the following are generally unreliable methods for sampling?

• Convenience sampling

• Voluntary response

• Simple random sampling

• Stratified random sampling

• Systematic sampling

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Determine if the distribution is Positively skewed, Negatively skewed or Normally distributed.

• Positively skewed

• Negatively skewed

• Normally distributed

Determine if the distribution is Positively skewed, Negatively skewed or Normally distributed.

• Positively skewed

• Negatively skewed

• Normally distributed

Are the following questions biased or unbiased?

a. Do you drink one or more cans of soda each day?

b. Don’t you think diet drinks taste awful?

• Both are biased

• Both are unbiased

• a is biased,

  b is unbiased

• a is unbiased,

  b is biased

Tags

CCSS.RL.11-12.6

Match the type of study (observational, survey, simulation, or experiment) would you use to research:

You use to research the effect of a new medicine on heart disease by comparing a group of people taking the new medicine and those taking a placebo?

• Experiment

• The effect of hurricane winds on a type of foundation material.

• Observation

• The favorite tv show of high school sophomores at DHS.

• Survey

• You use to research the effect of a new medicine on heart disease by comparing a group of people taking the new medicine and those taking a placebo?

• Simulation

• Noticing the way a person with a concussion behaves.

Tags

CCSS.HSS.IC.B.3