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=25
Mean=103
Standard deviation s=15
Answer: ____ <μ< _____
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=20
Mean x¯¯¯=104
Standard deviation s=14
<μ<
Construct a 95% confidence interval to estimate the population
mean with x=100 and σ=26 for the following sample sizes.
a)
n
equals=
35
b)
n
equals=
43
c)
n
equals=
60
With 95% confidence, when n=35, the population mean is between
the lower limit of _ and the upper limit of _.
Construct a 95% confidence interval to estimate the population
mean with x̅ =109 and σ=31 for the following sample sizes.
n =32
n =45
n =65
A) with 95% confidence when n = 32, the population mean is
between the lower limit ___ and upper limit ____ (round to 3
decimals)
B) with 95% confidence when n = 45, the population mean is
between the lower limit ___ and upper limit ____ (round to 3
decimals)
C) with 95% confidence...
Construct a 95% confidence interval to estimate the population
mean with x=118 and σ=25 for the following sample sizes.
a) n=38
b) n=41
c) n=69
a) With 95% confidence, when n= 38, the population mean is
between the lower limit of and the upper limit of . (Round to two
decimal places as needed.)
b) With 95% confidence, when n= 41, the population mean is
between the lower limit of and the upper limit of . (Round to two...
For the data set below, calculate r, r
2, and a 95% confidence interval in r units.
Then write a one- to two-sentence conclusion statement that
includes whether the null hypothesis was rejected or not. Assume a
two-tailed hypothesis and α = .05.
Case 1
Case 2
Case 3
Case 4
Case 5
Case 6
X
1.05
1.15
1.30
2.00
1.75
1.00
Y
2
2
3
4
5
2
At a confidence level of 95% a confidence interval for a
population proportion is determined to be 0.65 to 0.75. If the
sample size had been larger and the estimate of the population
proportion the same, this 95% confidence interval estimate as
compared to the first interval estimate would be
A. the same
B. narrower
C. wider
At a confidence level of 95% a confidence interval for a
population proportion is determined to be 0.65 to 0.75. If the
sample size had been larger and the estimate of the population
proportion the same, this 95% confidence interval estimate as
compared to the first interval estimate would be