In: Statistics and Probability
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.
|
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.)
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.
|
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 |