8:04 8 Exit 1. average credit card debt for a recent year was $8,776. Five years earlier the average credit card debt was $8,189. Assume sample sizes of 32 were used and The the population standard deviations of both samples were $690. Is there evidence to conclude that the average credit card debt has increased? Use a = 0.05 a. State the hypotheses. b. Find the critical value. c. Compute the test statistic. d. Make the decision. e. Summarize the results. a. Ho- µ1 = Hz; Hj: Hy < M2 Н, Н b. C.V. = 1.65 C. z = 3.40 d. do not reject e. There is not enough evidence to conclude that the average credit card debt has increased. а. Но: и, 8:04 18 Exit 2. Adults aged 16 or older were assessed in three types and quantitative. The scores in document of literacy: prose, document, literacy were the same for 19- to 24-year- olds and for 40- to 49-year-olds. A random sample of scores from a later year showed the following statistics. Population Age Mean standard sample group score deviation size 19-24 272 56.6 40 40-49 318 52.2 31 Construct a 95% confidence interval for the true difference in mean scores for these two groups. What does your interval say about the claim that there is no difference in mean scores? 24.6 <µ, - µ, < 67.4; The interval does not give evidence to reject the claim that there is no difference in the means because 0 is not contamed m the
8:04 8 Exit 1. average credit card debt for a recent year was $8,776. Five years earlier the average credit card debt was $8,189. Assume sample sizes of 32 were used and The the population standard deviations of both samples were $690. Is there evidence to conclude that the average credit card debt has increased? Use a = 0.05 a. State the hypotheses. b. Find the critical value. c. Compute the test statistic. d. Make the decision. e. Summarize the results. a. Ho- µ1 = Hz; Hj: Hy < M2 Н, Н b. C.V. = 1.65 C. z = 3.40 d. do not reject e. There is not enough evidence to conclude that the average credit card debt has increased. а. Но: и, 8:04 18 Exit 2. Adults aged 16 or older were assessed in three types and quantitative. The scores in document of literacy: prose, document, literacy were the same for 19- to 24-year- olds and for 40- to 49-year-olds. A random sample of scores from a later year showed the following statistics. Population Age Mean standard sample group score deviation size 19-24 272 56.6 40 40-49 318 52.2 31 Construct a 95% confidence interval for the true difference in mean scores for these two groups. What does your interval say about the claim that there is no difference in mean scores? 24.6 <µ, - µ, < 67.4; The interval does not give evidence to reject the claim that there is no difference in the means because 0 is not contamed m the
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:8:04
8
Exit
1.
average credit card debt for a recent
year was $8,776. Five years earlier the
average credit card debt was $8,189.
Assume sample sizes of 32 were used and
The
the population standard deviations of both
samples were $690. Is there evidence to
conclude that the average credit card debt
has increased? Use a = 0.05
a. State the hypotheses.
b. Find the critical value.
c. Compute the test statistic.
d. Make the decision.
e. Summarize the results.
a. Ho- µ1 = Hz; Hj: Hy < M2
Н,
Н
b. C.V. = 1.65
C. z = 3.40
d. do not reject
e. There is not enough evidence to
conclude that the average credit card
debt
has increased.
а. Но: и,
Transcribed Image Text:8:04
18
Exit
2.
Adults aged 16 or older were assessed in
three types
and quantitative. The scores in document
of literacy: prose, document,
literacy were the same for 19- to 24-year-
olds and for 40- to 49-year-olds. A random
sample of scores from a later year showed
the following statistics.
Population
Age
Mean
standard
sample
group
score
deviation
size
19-24
272
56.6
40
40-49
318
52.2
31
Construct a 95% confidence interval for the
true difference in mean scores for these two
groups. What does your interval say about
the claim that there is no difference in mean
scores?
24.6 <µ, - µ, < 67.4; The interval does
not give evidence to reject the claim that
there is no difference in the means
because 0 is not contamed m the
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