Question

For the following questions construct the indicated confidence interval for the population mean. Note c = confidence level, x ̅ which is equal to the sample mean, s = standard deviation, and n = sample size

a. c = 0.90, x ̅ = 12.3, s = 1.5, n = 50

b. c = 0.99, x ̅ = 10.5, s = 2.14, n = 45

Answer #1

Construct the indicated confidence interval for the population
mean using the t-distribution. Assume the population is normally
distributed.
c=0.99 x=13.2 s=4.0 n=8

Construct the indicated confidence interval for the population
mean using the? t-distribution. Assume the population is normally
distributed. c = 0.90?, x=14.4?, s=2.0?, n=10
The 90?% confidence interval using a? t-distribution is
(_,_)

1a. Construct the indicated confidence interval for
the population mean u using the t-distribution. Assume the
population is normally distributed.
c=0.95
x=12.6
s=3.0
n=5
(),() Round to one decimal place as needed.
1b.Construct the indicated confidence interval for the
population mean u using the t-distribution. Assume the population
is normally distributed.
c=0.99, x=12.4 s=0.73, n=18
(),() Round to one decimal place as needed.

Assume the sample is taken from a normally distributed
population and construct the indicated confidence
interval.
Construct the indicated confidence intervals for the population
variance σ 2 and the population
standard deviation σ. Assume the sample is from a normally
distributed population
c = 0.99, s = 228.1 , n
= 61

Construct the indicated confidence interval for the population
mean μ using the t-distribution. Assume the population is normally
distributed.
ce=0.99, x =13.9, s=3.0, n=6
The 99% confidence interval using a t-distribution is
____________.(Round to one decimal place as needed.)

Construct the indicated confidence interval for the population
mean
muμ
using the t-distribution. Assume the population is normally
distributed.
c=0.99
x overbarxequals=14.4
s=0.88
nequals=12

please answer all the questions
1. A Confidence Interval (CI) for a population characteristic
is:
An alternative to a Point Estimate
An interval of plausible values for a population
characteristic
An interval of ranges for a large sample that is unbiased
A population of critical values
Directions: Find each specified point estimate or confidence
interval.
2. A survey of teachers reports that a point estimate for the
mean amount of money spent each week on lunch is $18.00. If the...

Construct the indicated confidence interval for the population
mean of each data set. If it is possible to construct a confidence
interval, justify the distribution you used. If it is not possible,
explain why.
(a) In a random sample of 40 patients, the mean waiting time at
a dentist’s office was 20 minutes and the standard deviation was
7.5 minutes. Construct a 95% confidence interval for the population
mean.
(b) In a random sample of 20 people, the mean tip...

Construct the indicated confidence interval for the population
mean mu using the t-distribution. Assume the population is
normally distributed. c=0.95, x=13.4, s=0.64, n=19

Construct the indicated confidence interval for the population
mean μ using the t-distribution. Assume the population is normally
distributed.
c=0.95, x=14.8, s=0.89, n=13

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