Question
In: Statistics and Probability
The following are standardized cognitive scores for n=8 younger people and n=8 older people: Younger Older...
The following are standardized cognitive scores for n=8 younger people and n=8 older people: Younger Older 8 7 6 5 6 8 7 5 8 7 7 6 8 8 8 5 Calculate SS, variance, and standard deviation for both sets of people. Which group is more consistent? (less variability)
Solutions
orchestra answered 1 year agoRelated Solutions
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When the government taxes younger people to pay benefits to
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1. The scores of 10 people on standardized scales of introversion and shyness are shown below...
1. The scores of 10 people on standardized scales of
introversion and shyness are shown below (high scores on each scale
indicate high introversion and high shyness)
Person
Introversion
Shyness
1
17
22
2
6
4
3
12
10
4
13
8
5
19
11
6
20
18
7
9
10
8
4
3
9
8
10
10
21
16
a. Make a scatterplot of the data. What is the type of
relationship?
b. compute r and test it for...
1. The scores of 10 people on standardized scales of introversion and shyness are shown below...
1. The scores of 10 people on standardized scales of
introversion and shyness are shown below (high scores on each scale
indicate high introversion and high shyness)
Person
Introversion
Shyness
1
17
22
2
6
4
3
12
10
4
13
8
5
19
11
6
20
18
7
9
10
8
4
3
9
8
10
10
21
16
a. Make a scatterplot of the data. What is the type of
relationship?
b. compute r and test it for...
IQ scores are standardized such that the population of scores has a mean of 100 and...
IQ scores are standardized such that the population of scores
has a mean of 100 and a variance of 225. Assuming IQ scores have a
normal distribution, what proportion of scores will fall below 80?
What proportion will fall below 75?
What values occur in the top 9% of the distribution? What values
occur in the bottom 9% of the distribution?
A population of scores with a μ = 43 a n d σ = 8 is...
A population of scores with a μ = 43 a n d σ = 8 is standardized
to create a new population distribution with a μ = 50 a n d σ = 10
. What is the new X value for each of the following scores from the
original population?
a. X = 43
b. X = 47
c. X = 55
d. X = 35
The scores of a physics test of a random sample of students (n = 8) are...
The scores of a physics test of a random sample of students (n
= 8) are listed below. Is the sample significantly different from m
= 65?
State the null and alternative hypotheses
Set the criteria for a decision: two-tailed test with a =
.05
Compute the test statistic using SPSS
What is the effect size (you will need to compute Cohen’s
d from data given in the SPSS output table)
d= M- μ /
(SD)
(5 pts) Write the...
The following data are scores on a standardized statistics examination for independent random samples of students...
The following data are scores on a standardized statistics
examination for independent random samples of students from two
small liberal arts colleges.
College A: 78, 84, 81, 78, 76, 83, 79, 75, 85, 81
College B: 89, 78, 83, 85, 87, 78, 85, 94, 88, 87
Calculate the sample variance (or standard deviation) for each
college.
For the test of homogeneity,
Ho: σ²A = σ²B
Ha: σ²A ≠ σ²B
calculate the test statistic F'.
For α = 0.05, specify the...
4. A research study was conducted to examine the differences between older and younger adults on...
4. A research study was conducted to examine the differences
between older and younger adults on perceived life satisfaction. A
pilot study was conducted to examine this hypothesis. Ten older
adults (over the age of 70) and ten younger adults (between 20 and
30) were give a life satisfaction test (known to have high
reliability and validity). Scores on the measure range from 0 to 60
with high scores indicative of high life satisfaction; low scores
indicative of low life...
You investigate whether the older or younger male in pairs of brothers tends to be more...
You investigate whether the older or younger male in pairs of
brothers tends to be more extroverted. You obtain the following
extroversion scores:
Sample 1 (Younger)
Sample 2 (Older)
10
18
11
17
18
19
12
16
15
15
13
19
19
13
15
20
(a) What are H0 and Ha? (b) Compute tobt. (c) With ? 5 .05, what
is tcrit? (d)compute the 95% confidence interval for the mean
difference
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