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Nostrana [21]
2 years ago
15

Exhibit B In order to determine whether or not there is a significant difference between the hourly wages of two companies, two

independent random samples were selected and the following statistics were calculated. Company A Company B Sample size 80 60 Sample mean $6.75 $6.25 Population standard deviation $1.00 $0.95 Refer to Exhibit B. The value of the test statistic is _____.
a. 2.75
b. 0.098
c. 3.01
d. 1.645
Mathematics
1 answer:
ser-zykov [4K]2 years ago
7 0

Answer: c. 3.01

Step-by-step explanation:

The test statistic for difference between two population mean (when population standard deviation is known) is given by :

z=\dfrac{\overline{x}_1-\overline{x}_2}{\sqrt{\dfrac{\sigma_1^2}{n_1}+\dfrac{\sigma_2^2}{n_2}}}

, where n_1 = Size of first sample

n_2 = Size of second sample

\overline{x}_1-\overline{x}_2 = Difference between two sample mean.

\sigma_1 = standard deviation for population 1.

\sigma_2 = standard deviation for population 2.

As per given , we have

n_1=80

n_2=60

\overline{x}_1=\$6.75

\overline{x}_2=\$6.25

\sigma_1=\$1

\sigma_2=\$0.95

Substitute these values in formula , we get

z=\dfrac{6.75-6.25}{\sqrt{\dfrac{(1)^2}{80}+\dfrac{(0.95)^2}{60}}}

z=\dfrac{0.50}{\sqrt{0.0275416666667}}

z=\dfrac{0.50}{0.165956821694}

z=3.0128318613\approx3.01

Hence, the value of the test statistic is <u>3.01</u>.

Hence, the correct option is c. 3.01 .

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