Sx=13.050n-1050.000fy thatnean isinter-ider8.37 Grandmas using e-mail For the question about e-mail inECH the previous exercise, the 14 females in the GSS of age atleast 80 had the responsesed?0,0,0, 0, 1, 1, 1,2, 2, 6, 6, 7, 7, 10.ist-tablea. Using the web app, software or a calculator, find thesample mean and standard deviation and the standarderror of the sample mean.y Itb. Find and interpret a 90% confidence interval for thepopulation mean.c. Explain why the population distribution may beskewed right. If this is the case, is the interval youobtained in part b useless, or is it still valid? Explain.anу 2014ex plot9, 630.8.38 Wage discrimination? According to a union agreement,the mean income for all senior-level assembly-line work-ers in a large company equals $500 per week. A represen-tative of a women's group decides to analyze whether themean income for female employe es matches this norm.For a random sample of nine female employees, usingsoftware, she obtains a 95% confidence interval of (371,509). Explain what is wrong with each of the following in-terpretations of this interval.a. We infer that 95 % of the women in the populationhave income between $371 and $509 per week.95%ce onHOwained? Statistical Inference: Confidence Intervals364Chapter 8the sarb. If random samples of nine women were repeatedly se-lected, then 95% of the time the sample mean incomewould be between $371 and $509.size ofthe sathe apc. We can be 95% confident that x is between $371and $509.8.43 Effectestimd. If we repeatedly sampled the entire population,then 95% of the time the population mean would bebetween $371 and $509.deviatdencethe chHow often read a newspaper? For the FL StudentSurvey data file on the book's website, software reportsthe results for responses on the numberof times a weekthe subject reads a newspaper:8.39the ba8.44 Catalproduaboudecid95.0% CIMean Std Dev SE MeanVariablederec(3.307, 4.859)3.00.3884.160Newssampordea. Is it plausible that p 7, where u is the populationmean for all Florida students? Explain.mearof $1b. Suppose that the sample size had been 240, withx=4.1 and s 3.0. Find a 95% confidence intervaland compare it to the one reported. Describe the effectof sample size on the margin of error.c. Does it seem plausible that the population distributionof this variable is normal? Why?а. IsVb. Fthd. Explain the implications of the term robust regard-ing the normality assumption made to conduct thislctl

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Asked Nov 8, 2019
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8.38 A,B,C

Sx=13.050
n-1050.000
fy that
nean is
inter-
ider
8.37 Grandmas using e-mail For the question about e-mail in
ECH the previous exercise, the 14 females in the GSS of age at
least 80 had the responses
ed?
0,0,0, 0, 1, 1, 1,2, 2, 6, 6, 7, 7, 10.
ist-
table
a. Using the web app, software or a calculator, find the
sample mean and standard deviation and the standard
error of the sample mean.
y It
b. Find and interpret a 90% confidence interval for the
population mean.
c. Explain why the population distribution may be
skewed right. If this is the case, is the interval you
obtained in part b useless, or is it still valid? Explain.
an
у 2014
ex plot
9, 630.
8.38 Wage discrimination? According to a union agreement,
the mean income for all senior-level assembly-line work-
ers in a large company equals $500 per week. A represen-
tative of a women's group decides to analyze whether the
mean income for female employe es matches this norm.
For a random sample of nine female employees, using
software, she obtains a 95% confidence interval of (371,
509). Explain what is wrong with each of the following in-
terpretations of this interval.
a. We infer that 95 % of the women in the population
have income between $371 and $509 per week.
95%
ce on
HOw
ained?
help_outline

Image Transcriptionclose

Sx=13.050 n-1050.000 fy that nean is inter- ider 8.37 Grandmas using e-mail For the question about e-mail in ECH the previous exercise, the 14 females in the GSS of age at least 80 had the responses ed? 0,0,0, 0, 1, 1, 1,2, 2, 6, 6, 7, 7, 10. ist- table a. Using the web app, software or a calculator, find the sample mean and standard deviation and the standard error of the sample mean. y It b. Find and interpret a 90% confidence interval for the population mean. c. Explain why the population distribution may be skewed right. If this is the case, is the interval you obtained in part b useless, or is it still valid? Explain. an у 2014 ex plot 9, 630. 8.38 Wage discrimination? According to a union agreement, the mean income for all senior-level assembly-line work- ers in a large company equals $500 per week. A represen- tative of a women's group decides to analyze whether the mean income for female employe es matches this norm. For a random sample of nine female employees, using software, she obtains a 95% confidence interval of (371, 509). Explain what is wrong with each of the following in- terpretations of this interval. a. We infer that 95 % of the women in the population have income between $371 and $509 per week. 95% ce on HOw ained?

fullscreen
Statistical Inference: Confidence Intervals
364
Chapter 8
the sar
b. If random samples of nine women were repeatedly se-
lected, then 95% of the time the sample mean income
would be between $371 and $509.
size of
the sa
the ap
c. We can be 95% confident that x is between $371
and $509.
8.43 Effect
estim
d. If we repeatedly sampled the entire population,
then 95% of the time the population mean would be
between $371 and $509.
deviat
dence
the ch
How often read a newspaper? For the FL Student
Survey data file on the book's website, software reports
the results for responses on the numberof times a week
the subject reads a newspaper:
8.39
the ba
8.44 Catal
produ
abou
decid
95.0% CI
Mean Std Dev SE Mean
Variable
derec
(3.307, 4.859)
3.0
0.388
4.1
60
News
samp
orde
a. Is it plausible that p 7, where u is the population
mean for all Florida students? Explain.
mear
of $1
b. Suppose that the sample size had been 240, with
x=4.1 and s 3.0. Find a 95% confidence interval
and compare it to the one reported. Describe the effect
of sample size on the margin of error.
c. Does it seem plausible that the population distribution
of this variable is normal? Why?
а. Is
V
b. F
th
d. Explain the implications of the term robust regard-
ing the normality assumption made to conduct this
lc
tl
help_outline

Image Transcriptionclose

Statistical Inference: Confidence Intervals 364 Chapter 8 the sar b. If random samples of nine women were repeatedly se- lected, then 95% of the time the sample mean income would be between $371 and $509. size of the sa the ap c. We can be 95% confident that x is between $371 and $509. 8.43 Effect estim d. If we repeatedly sampled the entire population, then 95% of the time the population mean would be between $371 and $509. deviat dence the ch How often read a newspaper? For the FL Student Survey data file on the book's website, software reports the results for responses on the numberof times a week the subject reads a newspaper: 8.39 the ba 8.44 Catal produ abou decid 95.0% CI Mean Std Dev SE Mean Variable derec (3.307, 4.859) 3.0 0.388 4.1 60 News samp orde a. Is it plausible that p 7, where u is the population mean for all Florida students? Explain. mear of $1 b. Suppose that the sample size had been 240, with x=4.1 and s 3.0. Find a 95% confidence interval and compare it to the one reported. Describe the effect of sample size on the margin of error. c. Does it seem plausible that the population distribution of this variable is normal? Why? а. Is V b. F th d. Explain the implications of the term robust regard- ing the normality assumption made to conduct this lc tl

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Expert Answer

Step 1

a) We infer that 95% of the women in the population have income between $371 and $509 per week.

This conclusion is wrong because it is not telling about true population parameter i.e. mean.

b)

If random samples of nine women were repeatedly selected, then 95...

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