Answer :
The 98% confidence interval for the proportion of all entering freshmen at this college who scored more than 590 on the math SAT is approximately 0.283 to 0.493.
To find the point estimate for the proportion of all entering freshmen at this college who scored more than 590 on the math SAT, we divide the number of freshmen who scored more than 590 by the total sample size.
Point Estimate = Number of freshmen who scored more than 590 / Total sample size
In this case, the number of freshmen who scored more than 590 on the math SAT is 45, and the total sample size is 116.
Point Estimate = 45 / 116 ≈ 0.388
Rounded to three decimal places, the point estimate for the proportion of all entering freshmen at this college who scored more than 590 on the math SAT is approximately 0.388.
To construct a 98% confidence interval for the proportion of all entering freshmen at this college who scored more than 590 on the math SAT, we can use the following formula:
Confidence Interval = Point Estimate ± (Critical Value * Standard Error)
The critical value corresponds to the desired confidence level and is obtained from the standard normal distribution. For a 98% confidence level, the critical value is approximately 2.326.
The standard error can be calculated using the following formula:
Standard Error = sqrt((Point Estimate * (1 - Point Estimate)) / Sample Size)
Using the point estimate from part (a) as 0.388 and the sample size as 116, we can calculate the standard error:
Standard Error = sqrt((0.388 * (1 - 0.388)) / 116) ≈ 0.050
Now we can construct the confidence interval:
Confidence Interval = 0.388 ± (2.326 * 0.050)
Lower Bound = 0.388 - (2.326 * 0.050) ≈ 0.283
Upper Bound = 0.388 + (2.326 * 0.050) ≈ 0.493
Rounded to three decimal places, the 98% confidence interval for the proportion of all entering freshmen at this college who scored more than 590 on the math SAT is approximately 0.283 to 0.493.
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