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-Dominant- [34]
2 years ago
9

A national survey of middle school students asks how many hours of sleep they get on school nights. Which sample ​best​ represen

ts the population?
a.) A group of 941 students in eighth grade in a certain town
b.) A group of 886 students in sixth grade in a certain county
c.) A group of 795 students in seventh grade in different states
d.) A group of 739 students in different middle school grade levels from various states
Mathematics
1 answer:
mariarad [96]2 years ago
5 0

Answer:

D

Step-by-step explanation:

It wouldnt be a single grade being surveyed so we would choose d in additon a and b isnt national since it says 'in a certain town' and 'in a certain county'.

Which leaves you with D.

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In January, the depth of a lake was 1,014 feet. In August, the depth of the lake was 659.1 feet. What is the percentage decrease
Colt1911 [192]

Answer:

35% decrease

Step-by-step explanation:

To find the percent decrease, divide the difference in price by the original price:

(1014 - 659.1) / 1014

354.9 / 1014

= 0.35

So, the percent decrease was 35%

7 0
3 years ago
462.6017281 what is the nearest tenth
Westkost [7]

Answer:

462.60

Step-by-step explanation:

1-5 the #stays the same

6-10 goes to the next # up

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3 years ago
A. 2x = 5<br><br> What would be the answer I don’t know anyone help me before the 28th
Aleksandr [31]

Answer:

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Step-by-step explanation:

4 0
3 years ago
In which direction must the graph of f(x) = |x| be shifted to produce the graph of g(x) = |x − 3|?
ElenaW [278]

Answer:

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A. left

B. down

C. up

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Right is the right answer.

6 0
3 years ago
Read 2 more answers
In a study, researchers wanted to measure the effect of alcohol in the development of the hippocampal region in adolescents. The
lbvjy [14]

Answer:

Kindly check explanation

Step-by-step explanation:

Given :

Sample size, n = 30

Tcritical value = 2.045

Null hypothesis :

H0: μ = 9.08

Alternative hypothesis :

H1: μ≠ 9.08

Sample mean, m = 8.25

Samole standard deviation, s = 1.67

Test statistic : (m - μ) ÷ s/sqrt(n)

Test statistic : (8.25 - 9.08) ÷ 1.67/sqrt(30)

Test statistic : - 0.83 ÷ 0.3048988

Test statistic : - 2.722

Tstatistic = - 2.722

Decision region :

Reject Null ; if

Tstatistic < Tcritical

Tcritical : - 2.045

-2.722 < - 2.045 ; We reject the Null

Using the α - level (confidence interval) 0.05

The Pvalue for the data from Tstatistic calculator:

df = n - 1 =. 30 - 1 = 29

Pvalue = 0.0108

Reject H0 if :

Pvalue < α

0.0108 < 0.05 ; Hence, we reject the Null

4 0
3 years ago
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