1. Determine whether to use zα /2
or tα /2 . Find the critical
value.
Given n = 8 and s = 3 for a 95% confidence
interval.
2. Find tα /2 with n =
24 for a 98% confidence interval.
3. In a study of 100 middle school children, the mean number of
hours weekly spent playing video games was 15 hours with a standard
deviation of 2 hours. Find the point estimate for the true mean
number of hours weekly...
Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2, and the confidence
interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Nicotine in menthol cigarettes 90%
confidence; nequals23, sequals0.24 mg.
Use the given information to find the number of degrees of
freedom, the critical values 2χ2L and χ2R, and the confidence
interval estimate of sigma σ. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Platelet Counts of Women 98 % confidence; n=23
s=65.5.
df=22
(Type a whole number.)
2χ2L=9.542
(Round to three decimal places as needed.)
2χ2R=40.289
(Round to three decimal places as needed.)
The confidence interval estimate...
Use the given information to find the number of degrees of
freedom, the critical values 2χ2L and χ2R, and the confidence
interval estimate of sigma σ. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution.
Nicotine in menthol cigarettes 98% confidence; n= 27, s=0.27
mg.
df=
2χ2L=___
(Round to three decimal places as needed.)
2χ2=____
(Round to three decimal places as needed.)
The confidence interval estimate of σ is...
Use the given information to find the number of degrees of
freedom, the critical values 2χ2L and 2χ2R, and the confidence
interval estimate of sigmaσ. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Nicotine in menthol cigarettes 90%
confidence; n=30, s=0.23 mg.
Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2, and the confidence
interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Platelet Counts of Women 90% confidence;
nequals24, sequals65.4.
Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2, and the confidence
interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Platelet Counts of Women 90% confidence;
n=22, s=65.8.
Use the given information to find the number of degrees of
freedom, the critical values
chi Subscript Upper L Superscript 2χ2L
and
chi Subscript Upper R Superscript 2χ2R,
and the confidence interval estimate of
sigmaσ.
It is reasonable to assume that a simple random sample has been
selected from a population with a normal distribution.
Platelet Counts of Women
9898%
confidence;
nequals=2424,
sequals=65.165.1.
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Click the icon to view the table of Chi-Square critical
values.
Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 2
and chi Subscript Upper R Superscript 2, and the confidence
interval estimate of sigma. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution. Platelet Counts of Women 99% confidence;
nequals26, sequals65.1.
Use the given information to find the number of degrees of
freedom, the critical values 2χ2L and 2χ2R, and the confidence
interval estimate of sigmaσ. It is reasonable to assume that a
simple random sample has been selected from a population with a
normal distribution.
Nicotine in menthol cigarettes 90% confidence; n=2525,
s=0.270.27mg.