Statistical Inferences Unit Reivew

A recent survey found that out of 400 random American adults, 89% pay their bills on time. The margin of error in this survey was 2%. What is the interval of values in which the truth is likely found?

• 89% - 91%

• 87% - 89%

• 87% - 91%

• 388 - 402

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

How do we reduce variability?

• Increase randomness.

• Increase sample size.

• Decrease randomness.

• Decrease sample size.

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Why is a sample of 1000 people better than a sample of 100 people?

• It reduces the margin of error.

• It decreases bias.

• Having more people is always better.

• More people means that our results are more accurate.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

A recent survey of 2000 high schoolers found that 80% use their phones more than 4 hours a day on average, with a standard deviation of 1%. What is the interval for which we could expect to find the truth mean of the population?

• 2%

• 78% - 82%

• 93% - 97%

• 82%

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

Find the area of the shaded region.

• 16%

• 84%

• 68%

• 34%

Tags

CCSS.HSS.ID.A.4

A difference of -9 degrees is likely ______

• by grouping

• by treatment

A difference of $15 is likely ______

• by grouping

• by treatment

What is the mean?

• The number that occurs the most
• The number in the middle
• The difference between the highest and lowest values
• The Average

Tags

CCSS.6.SP.A.2

CCSS.6.SP.A.3

CCSS.6.SP.B.5

Find the mean of these numbers:
2, 57, 38, 42, 6

• 29
• 38
• 50
• 145

Tags

CCSS.HSS.ID.A.2

If we are 95% confident that the population mean is in the Interval of 114.56 and 125.54, then is it likely that the true population mean is greater than 130?

• Yes

• No

• Not enough information

• I have no idea what you're asking of me

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4