Ch 16 Confidence Intervals

A math teacher at a middle school wondered whether her students were registered for tutoring. In a sample of 50 students (randomly chosen from her 200 students), 42 said they were registered.

Does the above situation meet the Normal Distribution conditions? If not, state which condition(s) fail.

Would a 90% confidence interval be smaller or larger than a 95% confidence interval? Why?

Tags

CCSS.HSS.IC.B.4

A statistics professor at a large university wondered whether her students were registered to vote. In a sample of 50 students (randomly chosen from her 700 students), 35 said they were registered.

What is her  $P-hat$  ?

• .0714

• .7000

• .3000

• .0500

Tags

CCSS.HSS.IC.B.4

A statistics professor at a large university wondered whether her students were registered to vote. In a sample of 50 students (randomly chosen from her 700 students), 35 said they were registered.

What is her  $Q-hat$  ?

• .0714

• .7000

• .3000

• .0500

Tags

CCSS.HSS.IC.B.4

A statistics professor at a large university wondered whether her students were registered to vote. In a sample of 50 students (randomly chosen from her 700 students), 35 said they were registered.

What is her sample size?

• 50

• 35

• 700

• 15

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A statistics professor at a large university wondered whether her students were registered to vote. In a sample of 50 students (randomly chosen from her 700 students), 35 said they were registered.

What is her standard error? (round to 4 decimal places)

A statistics professor at a large university wondered whether her students were registered to vote. In a sample of 50 students (randomly chosen from her 700 students), 35 said they were registered.

What is her 95% Confidence Interval?

• (.5700, .8200)

• (.5621, .8397)

• (.5243, .8611)

• (.5730, .8296)

Tags

CCSS.HSS.IC.B.4

A statistics professor at a large university wondered whether her students were registered to vote. In a sample of 50 students (randomly chosen from her 700 students), 35 said they were registered.

If her margin error is too large. How could she lower it? check all that apply

• Increase her sample size

• Do not randomly choose her students

• Lower her confidence level

• Decrease her sample size

Tags

CCSS.HSS.IC.B.4

A statistics professor at a large university wondered whether her students were registered to vote. In a sample of 50 students (randomly chosen from her 700 students), 35 said they were registered.

According to a September 2004 Gallup poll, about 73% of 18- to 29-year-olds said that they were registered to vote. Does the 73% figure from Gallup seem plausible for the professor’s 700 students? Explain.

Tags

CCSS.7.SP.A.2