Use the following information for the next four problems. A researcher is interested in estimating the mean...

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Statistics

Use the following information for the next fourproblems. A researcher is interested in estimating themean salary of public school teachers in a particular region. Arandom sample of 9 teachers is selected and the salary of each oneis recorded. The researcher calculates a sample mean of $45,000 anda sample standard deviation of $1,600. Assume that the salaries inthe population vary according to a normal distribution.
The mean salary of all public school teachers in the region is a while the sample mean $45,000 is a .
a.
parameter, statistic
b.
statistic, parameter
c.
parameter, parameter
d.
statistic, statistic
Calculate a 95% confidence interval to estimate the meansalary.
a.
$45,000Â Â $348.44
b.
$45,000Â Â $1,206.40
c.
$45,000Â Â $1,229.87
d.
$45,000Â Â $1,045.33
Suppose, instead, that a larger sample of teachers had beenselected while still using the 95% confidence level. The newconfidence interval, based on the larger sample, would be__ the interval in the previous problem.
a.
shorter than
b.
the same length as
c.
longer than

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4.4 Ratings (567 Votes)

1 The mean salary of all public school teachers in the region is a parameter while the sample mean 45000 is a statistic option A is true 2 using excel we have See Answer

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	a.	parameter, statistic
	b.	statistic, parameter
	c.	parameter, parameter
	d.	statistic, statistic

	a.	$45,000Â Â $348.44
	b.	$45,000Â Â $1,206.40
	c.	$45,000Â Â $1,229.87
	d.	$45,000Â Â $1,045.33