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In: Statistics and Probability

THE question mark is where the answer is suppose to be thank you ! 1) A...

THE question mark is where the answer is suppose to be thank you !

1) A study asked respondents, "If ever married, how old were you when you first married?" The results are summarized in the technology excerpt that follows. Complete parts (a) through (d) below.

One-Sample T: AGEWED
Variable	N	Mean	StDev	SE Mean	9090.0% CI
AGEWED	2672026720	23.8423.840	4.7214.721	0.0290.029	(23.79223.792, 23.88823.888)

LOADING...

Click the icon to view the table of critical t-values.

(a) Use the summary to determine the point estimate of the population mean and margin of error for the confidence interval.

x overbarxequals=23.84023.840

(Type an integer or a decimal. Do not round.)

Eequals=???????????

(Type an integer or a decimal. Do not round.)

2)

People were polled on how many books they read the previous year. Initial survey results indicate that

sequals=14.614.6

books. Complete parts (a) through (d) below.

LOADING...

Click the icon to view a partial table of critical values.

(a) How many subjects are needed to estimate the mean number of books read the previous year within

sixsix

books with

9090%

confidence?This

90 %90%

confidence level requires ??????????? subjects. (Round up to the nearest subject.)

Expert Solution

THE question mark is where the answer is suppose to be thank you !

1) A study asked respondents, "If ever married, how old were you when you first married?" The results are summarized in the technology excerpt that follows. Complete parts (a) through (d) below.

One-Sample T: AGEWED
Variable	N	Mean	StDev	SE Mean	9090.0% CI
AGEWED	26720	23.840	4.721	0.029	(23.792,23.888)

(a) Use the summary to determine the point estimate of the population mean and margin of error for the confidence interval.

=23.840

(Type an integer or a decimal. Do not round.)

E=0.048

(Type an integer or a decimal. Do not round.)

2)

People were polled on how many books they read the previous year. Initial survey results indicate that

s=4.721

(a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90%

confidence?This 90% s confidence level requires 2 subjects.

Sample Size Determination

Data
Population Standard Deviation	4.721
Sampling Error	6
Confidence Level	90%

Intemediate Calculations
Z Value	-1.6449
Calculated Sample Size	1.6750

Result
Sample Size Needed	2

orchestra answered 1 year ago

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