What is the probability that a randomly selected adult is 35-44 or does not use social media?

125/530 + 192/530 - 36/530 = 0.530

What is the appropriate conclusion?

Since the interval is entirely positive, online homework had a higher mean.

Can causation be concluded?

Yes, it involves randomization, replication, and controlling.

Is there a significant linear relationship between years employed and sales per month using α = 0.1?

Yes, since 0.07 is less than 0.1.

What is the appropriate conclusion?

Reject H0. Sufficient evidence that concussions reduce brain size.

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SLCC Intro Stats Final Exam Review

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Questions 17

Answers

1
Between what two values do the middle 95% of adult systolic blood pressures fall?
80 to 160
60 to 180
20 to 120
100 to 140
2
What option should be selected in GeoGebra to do this calculation?
Z Estimate of a Proportion
Z Test of a Proportion
Z Estimate, Difference of Proportions
T Estimate of a Mean
3
What sampling method was used?
Simple Random
Stratified
Cluster
Systematic
4
What is the probability that a randomly selected adult is 35-44 or does not use social media?
125/530 + 192/530 - 36/530 = 0.530
(125/530)(192/530) = 0.085
36/530 = 0.068
125/530 + 192/530 = 0.598
5
What is the appropriate conclusion?
Since the interval is entirely positive, online homework had a higher mean.
Since the interval contains zero, the two groups are about the same.
Since the interval doesn't contain zero, the two groups are about the same.
Since the point estimate is positive, online homework had a lower mean.
6
What is the p-value?
0.4
0.8
0.7
0.107
7
How many students should be sampled?
757
13
14
756
8
What is the regression equation?
y-hat = 6.67x + 61.44
y-hat = 6.67 + 61.44x
y-hat = 3.53x + 37.92
y-hat = 3.53 + 37.92x
9
What is the correlation coefficient?
0.4
0.63
3.53
2.16
10
Can causation be concluded?
No, it's an observational study.
Yes, it involves randomization, replication, and controlling.
Yes, it's an experiment.
No, it is only single-blind, not double-blind.
11
Is there a significant linear relationship between years employed and sales per month using α = 0.1?
Yes, since 0.4 is greater than 0.1.
No, since 0.07 is less than 0.1.
Yes, since 0.07 is less than 0.1.
No, since 0.4 is greater than 0.1.
12
What would it be if you did not conclude that the proportion increased when it actually is more than 69%?
Type 2 Error
Type 1 Error
Correct Decision
13
What is the appropriate conclusion?
Do not reject H0. Insufficient evidence that concussions reduce brain size.
Reject H0. Insufficient evidence that concussions reduce brain size.
Reject H0. Sufficient evidence that concussions reduce brain size.
Do not reject H0. Sufficient evidence that concussions reduce brain size.
14
What are the hypotheses?
H0: μsurgeon = μliterature; HA: μsurgeon > μliterature
H0: μ = 0.7; HA: μ > 0.7
H0: p = 0.7; HA: p > 0.7
H0: psurgeon = pliterature; HA: psurgeon > pliterature
15
Find the fences used to determine outliers.
29, 46
38, 47
24.5, 60.5
-13, 89
16
What is the sample proportion?
0.8
0.4
0.7
0.107
17
What is the probability that a randomly selected adult uses social media given they are 55+?
115/338 = 0.340
49/530 = 0.092
49/338 = 0.145
49/115 = 0.426

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