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lbvjy [14]
3 years ago
6

An instructor of a biology class believes the average final exam score for his biology class was more than 75. Suppose a sample

of 25 was taken and the sample mean he observed was 78.48 and a standard deviation of 5 points. What is the value of the test statistic?Report your answer to 2 decimal places.
Mathematics
1 answer:
likoan [24]3 years ago
3 0

Answer:

The value for the test statistics = 3.48

Step-by-step explanation:

Given that:

population mean \mu = 75

sample size n = 25

sample mean \overline x= 78.48

standard deviation = 5

The value for the test statistics can be computed by using the formula:

z = \dfrac{\overline x- \mu}{\dfrac{\sigma}{\sqrt{n}}}

z = \dfrac{78.48- 75}{\dfrac{5}{\sqrt{25}}}

z = \dfrac{3.48}{\dfrac{5}{5}}

z = 3.48

The value for the test statistics = 3.48

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Genrish500 [490]

Given parameters:

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Unknown:

How much higher is Town R than M = ?

Solution:

Town M lies below the sea level whereas Town R is above the sea level.

     Graphically:

                                    Town R   679ft

                                         ↑

                                         ↑

                                         ↑

                                         ↑

                                    ↔↔↔  Sea level

                                         ↓

                                         ↓

                                    Town M     282ft

Town R is 282ft + 679ft higher than Town M  = 961ft

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Answer:

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