Question

Construct a 90% confidence interval to estimate the population proportion with a sample proportion equal to 0.50 and a sample size equal to 150. What are the upper and lower limits?

Answer #1

Z for 90% confidence interval = Z_{0.05} = 1.645

Confidence interval

= (0.433 , 0.567)

Construct a 99% confidence interval to estimate the population
proportion with a sample proportion equal to 0.36 and a sample size
equal to 100. A 99% confidence interval estimates that the
population proportion is between a lower limit of ___ and an upper
limit of ___

Construct a 95% confidence interval to estimate the population
proportion with a sample proportion equal to 0.60 and a sample size
equal to 450. LOADING... Click the icon to view a portion of the
Cumulative Probabilities for the Standard Normal Distribution
table. A 95% confidence interval estimates that the population
proportion is between a lower limit of nothing and an upper limit
of nothing.

1,) Construct a 90% confidence interval for the population
proportion if an obtained sample of size n = 150 has x = 30
2.) Construct a 95% confidence interval for the population mean
if an obtained sample of size n = 35 has a sample mean of 18.4 with
a sample standard deviation of 4.5.

Construct the 99% confidence interval estimate of the population
proportion p if the sample size is n=700 and the number of
successes in the sample is x=251.
____<p<____

Determine the sample size n needed to construct a 90 %
confidence interval to estimate the population proportion when p
equals 0.39 and the margin of error equals 5 %.
n=___

Determine the sample size needed to construct a 90% confidence
interval to estimate the average GPA for the student population at
a college with a margin of error equal to 0.5. Assume the standard
deviation of the GPA for the student population is 3.0. The sample
size needed is ?

Determine the sample size n needed to construct a 90?%
confidence interval to estimate the population mean when
? = 48 and the margin of error equals 8.
n =

Construct a 90% confidence interval to estimate the population
mean when x =62 and s =13.5 for the sample sizes below.
a)
n=20
b)
n=40
c)
n=60
a) The 90% confidence interval for the population mean when
n=20 is from a lower limit of nothing to an upper limit of nothing.
(Round to two decimal places as needed.)

Determine the sample size needed to construct a 90% confidence
interval to estimate the average GPA for the student population at
a college with a margin of error equal to 0.4. Assume the standard
deviation of the GPA for the student population is 3.5

Construct a confidence interval of the population proportion at
the given level of confidence. x equals 160, n equals 200, 90 %
confidence
The lower bound is ____. The upper bound is ____.

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