Whitney is an economics major and predicts that the cost spent on text books for her major is significantly more than last year. A random sample of14

economics majors were surveyed for a hypothesis test about the mean amount spent on textbooks this year. She conducted a one-mean hypothesis testat the1%

significance level, to test her prediction that the cost spent on text books is more than last year's at450

dollars.

df

df

t

0.10

t

0.10

t

0.05

t

0.05

t

0.025

t

0.025

t

0.01

t

0.01

t

0.005

t

0.005

...

...

...

...

...

...

...

13

13

1.350

1.771

2.160

2.650

3.012

14

14

1.345

1.761

2.145

2.624

2.997

15

15

1.341

1.753

2.131

2.602

2.947

16

16

1.337

1.746

2.120

2.583

2.921

Determine the critical value(s) using the partialt

table above. If entering two critical values, use

.