Question

Why does sample size affect the significance of r?

Answer #1

Larger sample sizes provide more accurate mean values, identify outliers that could skew the data in a smaller sample and provide a smaller margin of error.

All other things being equal, the larger the
**sample**, the more stable (reliable) the obtained
**correlation**.

Because **samples** vary randomly, from time to
time we will get a **sample correlation coefficient**
that is much larger or smaller than the true population figure.

..................

THANKS

revert back for doubt

please upvote

Why many biomolecules are very large? Does its size affect its
function ?

What is the significance of the R-T interval? Does this
represent systole or diastole, and why? Explain, using the position
of each of the four valves of the heart.

Suppose x+r denotes the
sample mean in a sample of size r,
and
assume:
x+r ~ N(
µ = 350, σ2 /
r).
If r < s, what
is the
efficieny of x+r relative
to x+s ?
Consider the pooled mean obtained by mixing two
samples of size r
and size s. What is the efficiency
of the pooled mean relative to x+r
?

Suppose x+r denotes the
sample mean in a sample of size r,
and
assume:
x+r ~ N(
µ = 350, σ2 /
r).
(i)
If r < s, what is
the
efficieny of x+r relative
to x+s ?
(ii) Consider the
pooled mean obtained by mixing two samples of
size r
and size s. What
is the efficiency of the pooled mean relative
to x+r ?

Why
does decreasing the slope of a regression line lead to an increase
in sample size?

Why does the standard error of the mean decrease as the
sample size, n, increases?

Why would you blame the small sample size of a study for the
lack of statistical significance? How are statistical significance
and sample size connected?

Given the linear correlation coefficient r and the sample size
n, determine the critical values of r and use your finding to state
whether or not the given r represents a significant linear
correlation. Use a significance level of 0.05. r = 0.353, n =
15

Given the linear correlation coefficient r and the sample size
n, determine the critical values of r and use your finding to state
whether or not the given r represents a significant linear
correlation. Use a significance level of 0.05. r = 0.105, n =
15

Given the linear correlation coefficient r and the sample size
n, determine the critical values of r and use your finding to state
whether or not the given r represents a significant linear
correlation. Use a significance level of 0.05. r = 0.105, n =
15

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 36 minutes ago

asked 38 minutes ago

asked 46 minutes ago

asked 50 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago