Math 3 Unit 7 Test 2022

A sample in which some members are more likely to be chosen than others.

• Biased Sample

• Random Sample

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Carlos wants to know the favorite sport of people at his school so he asks every 5th person he sees for a day.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Jake wants to know the average student’s opinion of the dress code policy at his school. Which group of students should he survey in order to achieve the most accurate results?

• The mathletes after school club

• His drama class

• The girls basketball team

• A random group of different people from the lunchroom

Larger random sample sizes are less representative of a population.

• True

• False

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Selah is a food scientist who wants to know whether organic food can help people live longer. She sets up an experiment to see whether mice raised on organic food a have longer life span.

Selah randomly sorts her mice into two equal groups. She raises the mice in one group on organic food and the others on nonorganic food. She observes how long they live.

Is this experiment statistically well designed?

• No

• Yes

• Not enough information

Tags

CCSS.HSS.IC.B.3

If 10 is added to every value in a set of data, what will happen to the value of the mean?

• it will increase by 10
• it will decrease by 10
• it will stay the same
• it will both increase and decrease

If 10 is added to every value in a set of data, what will happen to the value of the standard deviation?

• it will increase
• it will decrease
• it will stay the same
• it will both increase and decrease

A random sample of 45 life insurance policy holders showed that the average premiums paid on their life insurance policies was $340 per year with a standard deviation of $62. Construct a 95% confidence interval for the population mean. Round to the nearest hundredth

• [321.52, 358.48]

• [238.63, 441.37]

• [253.64, 426.36]

• [328.57, 351.43]

Tags

CCSS.HSS.IC.B.4

A researcher wishes to estimate, within $25, the true mean amount of postage a community college spends each year. The standard deviation is known to be $80. If she wishes to be 95% confident in her estimate of the true mean amount of postage, how large a sample is necessary? Round to the nearest whole number

• 41

• 25

• 80

• 200

Tags

CCSS.HSS.IC.B.4

Complete the following statement about the change in size.

If you increase the size of your sample, the margin of error will . . . .

• increase

• decrease

• stay the same

Tags

CCSS.HSS.IC.B.4