home runs per 100 times at bat.

A random sample of 43 professional baseball

1.6

2.4

1.2

6.6

2.3

0.0

1.8

2.5

6.5

1.8

2.7

2.0

1.9

1.3

2.7

1.7

1.3

2.1

2.8

1.4

3.8

2.1

3.4

1.3

1.5

2.9

2.6

0.0

4.1

2.9

1.9

2.4

0.0

1.8

3.1

3.8

3.2

1.6

4.2

0.0

1.2

1.8

2.4

(a)Use a calculator with mean and standard deviation keys to findands(in percentages). (For each answer, enter a number. Round your answers to two decimal places.)

=

x bar = ___%

s=___%

(b)Compute a 90% confidence interval (in percentages) for the population meanof home run percentages for all professional baseball players.Hint:If you use theStudent'stdistribution table, be sure to use the closestd.f.that issmaller. (For each answer, enter a number. Round your answers to two decimal places.)

lower limit____%

upper limit____%

(c)Compute a 99% confidence interval (in percentages) for the population meanof home run percentages for all professional baseball players. (For each answer, enter a number. Round your answers to two decimal places.)

lower limit___%

upper limit___%