Question

Your degrees of freedom is 55. Looking at the table of critical values for the correlation coefficient, you can see that there are only entries for 50 and 60 degrees of freedom, not 55. If you want to be more conservative, which entry should you choose?

Answer #1

Critical value selection.

The t-chart only has certain values for degrees of freedom
(n=1-30, 40,50,…,120, ∞). If the degrees of freedom you are looking
for does not appear on the chart, go to the LOWER value on the
chart. For example, if you have 47 degrees of freedom, use the
corresponding t-values for 40 degrees of freedom. This is
considered a “conservative solution.” Why do you think you would
use the LOWER degrees of freedom and not the HIGHER value?

a. For the following degrees of freedom, list the critical
values for a one-tailed and two-tailed test at a .01 and .05 level
of significance.
.01 .05
df = (Infinity) ___ ___ (One-tailed test)
df = (Infinity) ___ ___ (Two-tailed test)
b. Refer to Table 8.4 in Chapter 8. How do the critical values
you listed in the previous question compare with those listed for
the z-distribution. Explain.

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 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...

Determine (a) the χ2 test statistic, (b) the degrees
offreedom, (c) the critical value using alpha equals α=0.05,
and(d) test the hypothesis at the alpha equals α=0.05 level of
significance.
Outcome
A
B
C
D
Observed
48
52
51
49
Expected
50
50
50
50
Ho : Pa = Pb = Pc = Pd = 1/4
H1 : At least one proportions is different from the others.
a) The test statistic is
b) The degrees of freedom are one less...

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 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...

Do a Hypothesis Test for the Correlation Coefficient ,r, that
you calculated in the previous HW problem, Correlation(Part 1)
.
Assume that you want to test for a positive correlation. Let
α,your level of significance ,be .05.The number of observations, n,
is 5.Use n-2 degrees of freedom. Do you reject or do not reject
H0 ?
You need to do the 6 steps for the Neymann-Pearson critical
value test.You do not need to do a Fisher p-value test for the...

Use the given information to find the number of degrees of
freedom, the critical values chi Subscript Upper L Superscript 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 80%
confidence; n equals=29 s equals=0.26 mg.
Area to the Right of the Critical Value
...

In this problem, we use your critical values table to explore
the significance of r based on different sample sizes. (a) Is a
sample correlation coefficient ρ = 0.84 significant at the α = 0.01
level based on a sample size of n = 5 data pairs? What about n = 11
data pairs? (Select all that apply.) Yes, because the absolute
value of the given correlation coefficient is greater than or equal
to that for a sample size of...

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