Question

Give the t α 2 value for a 95% confidence interval for a
population mean generated from a sample of size *n* = 10
with a sample mean of x ¯ = 19.8oz and a standard deviation of
*s* = 1.2oz.

Answer #1

Give the upper bound for a 95% confidence interval for a
population mean generated from a sample of size n = 10
with a sample mean of x ¯ = 19.8oz and a standard deviation of
s = 1.2oz.

Give the value of zα2 for a 94% confidence interval for a
population proportion generated from a sample of size n =
125 with a sample proportion value of p¯ = 0.715.

For this term, we will create confidence intervals to estimate a
population value using the general formula:
sample estimator +/- (reliability factor)(standard error
of the estimator)
Recall that the (reliability factor) x (standard error of the
estimator)= margin of error (ME) for the interval.
The ME is a measure of the uncertainty in our estimate of the
population parameter. A confidence interval has a width=2ME.
A 95% confidence interval for the unobserved population
mean(µ), has a confidence level =
1-α...

Use the given data to find the 95% confidence interval estimate
of the population mean μ. Assume that the population has a normal
distribution. IQ scores of professional athletes: Sample size n=10
Mean x¯=106 Standard deviation s=12
______<μ<________

1) Find the critical value t (a/2) needed to construct a
confidence interval of the given level with the given sample size.
Round the answers to three decimal places
a) 98% sample size 11
critical value-
b) for level 95% and sample size 25
critical value-
c)for level 99% and sample size 14
2) a sample of size n equals 45 has a sample mean X equals 56.9
and sample standard deviation s equals 9.4.
construct a 99% confidence interval...

Use the given data to find the 95% confidence interval estimate
of the population mean μ. Assume that the population has a normal
distribution. IQ scores of professional athletes: Sample size n=30
Mean x¯¯¯=103 Standard deviation s=12

T/F Question and explain
1.A 95% confidence interval for population mean μ is 65.6±12.8
from a sample of size n=96. If one took a second random sample of
the same size, then the probability that the 95% confidence
interval for μ based on the second sample contains 65.6 is
0.95.
2.The probability of a Type I error when α=0.05 and the null
hypothesis is true is 0.05.
3.Because an assumption of ANOVA is that all of the population
variances are...

Find the margin of error for a 95% confidence interval for
estimating the population mean when the sample standard deviation
equals 90 with a sample size of (i) 484 and (ii) 1600
(i) Find the margin of error for a 95% confidence interval for
estimating the population mean when the sample standard deviation
equals 90 with a sample size of 484
(ii).
(ii) Find the margin of error for a 95% confidence interval
for estimating the population mean when the...

you are calculating a confidence interval for the population
mean. Find the critical value t* from the t-Distribution Critical
Values table for each of the following situations
A 95% confidence interval based on n = 12 observations.
A 99% confidence interval from a sample of two observations.
A 90% confidence interval from a sample of size 1001.
2. Suppose you conduct a hypothesis test for the following
hypotheses from a sample of n = 25 observations, and you calculate
a...

Find the following critical t-scores used in an 88% confidence
interval for a population mean when the population’s standard
deviation (σσ) is unknown. Give each answer to at least three
decimal places.
The t-critical value for an 88% confidence interval with sample
size 38 is:
The t-critical value for an 88% confidence interval with sample
size 48 is:
The t-critical value for an 88% confidence interval with sample
size 64 is:
The t-critical value for an 88% confidence interval with...

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