Question

Use the given degree of confidence and sample data to construct a confidence interval for the population mean µ. Assume that the population has a normal distribution.

6) The football coach randomly selected ten players and timed how long each player took to perform a certain drill.

The times (in minutes) were:

7.8 | 10.6 | 9.9 | 8.1 | 11.5 |

7.2 | 6.2 | 11.1 | 10.6 | 12.9 |

Determine a 95% confidence interval for the mean time for all players.

Answer #1

Confidence interval for Population mean is given as below:

Confidence interval = Xbar ± t*S/sqrt(n)

From given data, we have

Xbar = 9.59

S = 2.151201215

n = 10

df = n – 1 = 9

Confidence level = 95%

Critical t value = 2.2622

(by using t-table)

Confidence interval = Xbar ± t*S/sqrt(n)

Confidence interval = 9.59 ± 2.2622*2.151201215/sqrt(10)

Confidence interval = 9.59 ± 1.5389

Lower limit = 9.59 - 1.5389 = 8.05

Upper limit = 9.59 + 1.5389 =11.13

Confidence interval = (8.05, 11.13)

Use the given degree of confidence and sample data to
construct a confidence interval for the population mean μ. Assume
that the population has a normal distribution.
The football coach randomly selected ten players and timed how long
each player took to perform a certain drill. The times (in minutes)
were:
7.1 10.5 9.0 8.9 11.2
7.0 6.3 11.1 10.8 12.3
Determine a 95% confidence interval for the mean time for all
players.
Select one:
a. 10.93 min < μ...

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Group of answer choices
(19.7, 22.5)
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a)State the hypothesis
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c)State the p value
d)Determine the null hypothesis
e) Concluding statement
[I checked twice. This is the exactly same question I got, no
more information given....

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