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3 years ago

30 POINTS Anyone got an idea for 7 and 8?

Mathematics

1 answer:

Harrizon [31]3 years ago

5 0

7. i would guess 95-100 people were surveyed. the way you estimate this is by adding the number of students in each category. ex. about 3 in the first bar, about 9 in the next
8. no, you could not list the exact height because the data given only shows the number of students in between 75-80, not their actual height.

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A simple random sample of size nequals40 is drawn from a population. The sample mean is found to be 103.9, and the sample stand

yan [13]

Answer:

There is enough evidence to support the claim that the population mean is greater than 100

Step-by-step explanation:

Step 1: We state the hypothesis and identify the claim

$H_0:\mu=100$ and $H_1:\mu \:>\:100$ (claim)

Step 2: Calculate the test value.

$t=\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$

$\implies t=\frac{103.9-100}{\frac{21.9}{\sqrt{40} } }=1.1263$

Step 3: Find the P-value. The p-value obtained from a calculator is using d.f=39 and test-value 1.126 is 0.134

Step 4: We fail to reject the null hypothesis since P-value is greater that the alpha level. (0.134>0.05).

Step 5: There is enough evidence to support the claim that the population mean is greater than 100.

Alternatively: We could also calculate the critical value to obtain +1.685 for $\alpha=0.05$ and d.f=39 and compare to the test-value:

The critical value (1.685>1.126) falls in the non-rejection region. See attachment.

NB: The t- distribution must be used because the population standard deviation is not known.

5 0

4 years ago

I need clear steps to solve this. I am struggling with this part.

MissTica

In order to find the average of all the costs, first you need to add up all of the expenditures from each month. (ex. 1,084.45+886.40+968.45+1,117.60+995.80+1,379.86) After you find the solution from adding those numbers together, divide the solution by the amount of costs there are in order to find the average. Since it was for 6 months, get the total from the addition problem and divide it by 6 and that will be your answer.

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3 years ago

What is the solution to this equation 5= 2/5 a

ira [324]

Answer:

Need more explanation

Step-by-step explanation:

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3 years ago

A bird was sitting 12 feet from the base of an oak tree and flew 20 feet to reach the top of the tree. How tall is the tree?

BARSIC [14]

Answer:

It should be 12+20= 32 ft

Step-by-step explanation:

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3 years ago

The rectangular walkway will be 3 feet wide and 18 feet long. each 2-foot by 3-foot stone covers an area of 6 square feet. how m

anygoal [31]

3x18=54sq ft
2x3=6sq ft
54/6=9 stones needed

7 0

3 years ago

** 30 POINTS ** Anyone got an idea for 7 and 8?

30 POINTS Anyone got an idea for 7 and 8?