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Akimi4 [234]
2 years ago
8

PH = -log10 (C).

Mathematics
1 answer:
balu736 [363]2 years ago
6 0
B, 5-10 is right I believe
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A study claims that college students spend an average of 4 hours or less studying per day. A researcher wants to check if this c
kirill115 [55]
<h2>Answer with explanation:</h2>

Let \mu be the population mean.

By observing the given information, we have :-

H_0:\mu\leq4\\\\H_a:\mu>4

Since the alternative hypotheses is left tailed so the test is a right-tailed test.

We assume that the time spend by students per day is normally distributed.

Given : Sample size :  n=121 , since n>30 so we use z-test.

Sample mean : \overline{x}=3.15

Standard deviation : \sigma=1.2

Test statistic for population mean :-

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

\Rightarrow\ z=\dfrac{3.15-4}{\dfrac{1.2}{\sqrt{121}}}\\\\\Rightarrow\ z=-7.79166666667\approx-7.79

Critical value (one-tailed) corresponds to the given significance level :-

z_{\alpha}=z_{0.1}=1.2816

Since the observed value of z (-7.79) is less than the critical value (1.2816) , so we do not reject the null hypothesis.

Hence, we conclude that we have enough evidence to accept that the college students spend an average of 4 hours or less studying per day.

4 0
3 years ago
Alicia is going to the animal shelter to adopt a new pet. If there are 15 cats, 24 dogs and 3 horses, what is the probability sh
zimovet [89]

15+24+3=42

24/42 simplified is 4/7

4 0
2 years ago
Read 2 more answers
Pls help its not that hard, im in 7th grade
Kamila [148]

i think it's 20 but i'm not that sure

5 0
2 years ago
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It is 2.8km from David’s house to the nearest mailbox. How far is it in meters?
Ganezh [65]

Solution

Distance in km = 2.8 km

Distance in m = 2.8 x 1000m

Distance in m = 2,800m

5 0
10 months ago
The area of the rectangle shown is 200 square units. Find the value of x?
Stels [109]

Answer:

x=40

Step-by-step explanation:

8(1/2x + 5) = 200

4x + 40 = 200

4x = 160

x = 40

6 0
3 years ago
Read 2 more answers
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