Question

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.

Answer #1

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?

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<____

We would like to construct a confidence interval for the mean μ
of some population. Which of the following combinations of
confidence level and sample size will produce the narrowest
interval?
A)
99% confidence, n = 35
B)
95% confidence, n = 30
C)
95% confidence, n = 35
D)
90% confidence, n = 30
E)
90% confidence, n = 35

A simple random sample size of n = 75 is obtained from a
population whose size is N = 10000 and whose population proportion
with a specified characteristic is p = 0.8.
a) What is the probability of obtaining x = 63 or more
individuals with the characteristic?
b) Construct a 90% interval for the population proportion if x =
30 and n = 150.

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 =

A random sample of size n=55 is obtained from a
population with a standard deviation of σ=17.2, and the
sample mean is computed to be x=78.5.
Compute the 95% confidence interval.
Compute the 90% confidence interval.
SHOW WORK

Use the given degree of confidence and sample data to construct
a confidence interval for the population mean μ. Assume that the
population has a normal distribution.
n = 30, = 84.2, s = 18.4, 90% confidence

construct a Confidence interval for the population
mean using the information below. Confidence level: 90%, sample
size : 139, standard deviation : 17.54, mean : 106.41.

Construct a confidence interval of the population proportion at
the given level of confidence.
x equals 45 comma n equals 150 comma 95 % confidencex=45, n=150,
95% confidence

Assuming that the population is normally distributed, construct
a 90 % confidence interval for the population mean, based on the
following sample size of n equals 6. 1, 2, 3, 4 comma 5, and 30
In the given data, replace the value 30 with 6 and recalculate the
confidence interval. Using these results, describe the effect of
an outlier (that is, an extreme value) on the confidence
interval, in general. Find a 90 % confidence interval for the
population mean,...

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