I need help please I need help please I need help please

A researcher wants to study the average miles run per day for marathon runners. In testing the hypotheses: H0: μ = 25 miles vs.

masya89 [10]

Answer:

The calculated value |Z| = 1.325 < 1.881 at 0.03 level of significance

Null hypothesis is accepted

Alternative hypothesis is rejected

A researcher wants to study the average miles run per day for marathon runners is 25

Step-by-step explanation:

Step(i):-

Given sample size 'n' = 36

Given mean of the sample x⁻ = 22.8 miles

Given mean of the Population 'μ' = 25

Given standard deviation of the Population 'σ' = 10

Null hypothesis:-H₀: μ = 25

Alternative Hypothesis:H₁:μ ≠ 25

Level of significance = 3 % or 97%

The critical value Z₀.₉₇ = 1.881

Step(ii):-

Test statistic

$Z = \frac{x^{-} - mean}{\frac{S.D}{\sqrt{n} } }$

$Z = \frac{22.8 - 25}{\frac{10}{\sqrt{36} } }$

Z = -1.325

|Z| = |-1.325| = 1.325

The calculated value |Z| = 1.325 < 1.881 at 0.03 level of significance

Null hypothesis is accepted

Alternative hypothesis is rejected

conclusion:-

A researcher wants to study the average miles run per day for marathon runners is 25

6 0

3 years ago

The height h of a square pyramid can be determined from the equation h = l2−(s2)2−−−−−−−−√ , where l is the slant height of the

Anna [14]

Answer:

I believe the answer is 34 cm (I may be wrong but I'm 98% that my answer is correct)

Step-by-step explanation:

(excuse my handwriting on the ss its hard to write on a computer lol)

hope this helps :)

3 0

2 years ago

What is 7(x -2) + 3(x + 2) = 5(x - 6)?

Inessa [10]

Step-by-step explanation:

7(x-2)+3 (x+2)=5 (x-6)

7x-14+3x+6=5x-30
10x-8=5x-30
10x-5x=-30+8
5x=-22
x=-22/5

3 0

3 years ago

Read 2 more answers

A group of students with normally distributed salaries earn an average of 6800 with a standard deviation of $2500. Find the cuto

kherson [118]

Answer: $5115

Step-by-step explanation:

The following information can be gotten from the question:

Mean = 6800

Standard deviation = 2500

We will then find the Z score of the 25th percentile which will be -0.674.

Therefore, the cutoff for the salary that corresponds to the lower 25% of all salaries will be:

= 6800 - 0.674 × 2500

= 6800 - 1685

= 5115

The cutoff is $5115

8 0

3 years ago

PLEASE PLEASE HELP ME...joanne cannot decide which of two washing machines to buy. The selling price of each is $.480 The first

andrey2020 [161]

Answer:

Washing Machine 1 $480 × .5030 = $241.44

$480 - $241 = $238.56

So Wahsing Machine #1 was $480 and was marked down by .5030% which takes off $241.44 which brings us to the total to $238.56

Washington Machine #2

$480 × .30% = $144 × .20% = $28.80

So Washing Machine 2 was $480 and was marked down by .30% which took off $144 and was marked down by an additional .20% which took off an additional $28.80 which brings the Grand Total of $307.20.

Joanne should buy the first Washing Machine rather than the second Washing Machine because the first Washing Machine is $68.64 cheaper than the second Washing Machine.

7 0

3 years ago

Read 2 more answers