Question

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. Nicotine in menthol cigarettes 95% confidence; nequals=30, sequals=0.27 mg.

Answer #1

ci = (n-1) s^2 / ᴪ^2 right < σ^2 < (n-1) s^2 / ᴪ^2 left

where,

s = standard deviation

ᴪ^2 right = (1 - confidence level)/2

ᴪ^2 left = 1 - ᴪ^2 right

n = sample size

since alpha =0.05

ᴪ^2 right = (1 - confidence level)/2 = (1 - 0.95)/2 = 0.05/2 =
0.025

ᴪ^2 left = 1 - ᴪ^2 right = 1 - 0.025 = 0.975

the two critical values ᴪ^2 left, ᴪ^2 right at 29 df are 45.7223 ,
16.047

s.d( s )=0.27

sample size(n)=30

confidence interval for σ^2= [ 29 * 0.0729/45.7223 < σ^2 < 29
* 0.0729/16.047 ]

= [ 2.1141/45.7223 < σ^2 < 2.1141/16.0471 ]

[ 0.0462 < σ^2 < 0.1317 ]

and confidence interval for σ = sqrt(lower) < σ <
sqrt(upper)

= [ sqrt (0.0462) < σ < sqrt(0.1317), ]

= [ 0.215 < σ < 0.363 ]

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. Nicotine in menthol cigarettes 95%
confidence;
nequals=27, sequals=0.24mg.
please help, thank you

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.Nicotine in
menthol cigarettes
8080%
confidence;
nequals=2929,
sequals=0.250.25
mg.
LOADING...
Click the icon to view the table of Chi-Square critical
values.
df=
(Type a whole number.)

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
99%
confidence;
nequals=29
sequals=65.5

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 99% confidence; n=23, s=0.27 mg.
Use the given information to find the number of degrees of
freedom, the critical values chi...

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 99% confidence; nequals23,
sequals0.22 mg.

Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 2
χ2L and chi Subscript Upper R Superscript 2 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 95 95 %
confidence; n equals = 25 25 , s equals = 0.28 0.28 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. Nicotine in menthol cigarettes 98%
confidence; nequals21, sequals0.28 mg. LOADING... Click the icon
to view the table of Chi-Square critical values. dfequals nothing
(Type a...

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 99?%
?confidence; nequals30?, sequals0.24 mg. LOADING... Click the icon
to view the table of? Chi-Square critical values. dfequals nothing
?(Type a...

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 80% confidence; n = 25, s =
65.9.
df =
χ2L (chi Subscript Upper L Superscript 2) =
XR2...

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 95% confidence;
n=26, s=65.9

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