STA 2023 Worksheet #11 Answers

1) H_o:

H_a: claim

One-tail

Reject H_o

The data supports the claim that less than 20% of households used e-mail in 1997.

2) H_o: claim

H_a: .43

Two-tail

Reject H_o

The data does not support the claim that 43% say they voted for the winning candidate.

3) H_o: claim

H_a:

Two-tail

Fail to reject H_o

The data supports the claim that 1% of sales are overcharges.

4) H_o:

H_a: claim

One-tail

Reject H_o

The data supports the claim that smoking among those with 4 years of college is less than 27%.

5) H_o:

H_a: claim

One-tail

Reject H_o

The data supports the claim that more than half of drivers change CD’s while driving.

6) H_o:

H_a: claim

One-tail

Reject H_o

The data supports the claim that more than 60% oppose this law.

7) H_o:

H_a: claim

One-tail

Crit.

Calc.

Reject H_o

Data supports claim that proportion increased.