Question

Suppose that X has distribution N(μ, 4). A sample of size 25 yields a sample mean X = 78.3. Obtain a 99-percent (two-sided) confidence interval for μ.

Answer #1

Suppose that X has distribution N(μ, 4). A sample of size 25
yields a sample mean X = 78.3. Obtain a 99-percent (two-sided)
confidence interval for μ.

Suppose an x distribution has mean μ = 4. Consider two
corresponding x distributions, the first based on samples of size n
= 49 and the second based on samples of size n = 81.
(a) What is the value of the mean of each of the two x
distributions? For n = 49, μ x =
For n = 81, μ x =

Suppose x has a mound-shaped distribution. A random sample of
size 16 has sample mean 10 and sample standard deviation 2.
(b) Find a 90% confidence interval for μ
(c) Interpretation Explain the meaning of the confidence
interval you computed.

Suppose x has a normal distribution with mean μ = 45 and
standard deviation σ = 10.
Describe the distribution of x values for sample size n = 4.
(Round σx to two decimal places.)
μx =
σx =
Describe the distribution of x values for sample size n = 16.
(Round σx to two decimal places.)
μx =
σx =
Describe the distribution of x values for sample size n = 100.
(Round σx to two decimal places.)
μx...

Suppose x has a distribution with μ = 25 and
σ = 22.
(a) If a random sample of size n = 40 is drawn, find
μx, σx
and P(25 ≤ x ≤ 27). (Round
σx to two decimal places and the
probability to four decimal places.)
μx =
σx =
P(25 ≤ x ≤ 27) =
(b) If a random sample of size n = 56 is drawn, find
μx, σx
and P(25 ≤ x ≤ 27). (Round
σx...

Suppose x has a distribution with μ = 25 and
σ = 2.
(a) If random samples of size n = 16 are selected, can
we say anything about the x distribution of sample
means?
Yes, the x distribution is normal with mean
μx = 25 and
σx = 0.5.No, the sample size is too
small. Yes, the x
distribution is normal with mean μx =
25 and σx = 2.Yes, the x
distribution is normal with mean μx =
25...

. A sample of 25 items yields X(bar) = 60 grams and s = 9 grams.
Assuming a normal parent distribution, construct a 99 percent
confidence interval for the population mean weight.

A sample of 25 items yields X-bar = 60
grams and s = 5 grams. Assuming a normal parent distribution,
construct a 99 percent confidence interval for the population mean
weight.

Suppose an x distribution has mean μ = 4. Consider two
corresponding x distributions, the first based on samples of size n
= 49 and the second based on samples of size n = 81.
(a) What is the value of the mean of each of the two x
distributions?
For n = 49, μ x =
For n = 81, μ x =
(b) For which x distribution is P( x > 5) smaller?
Explain your answer.
The distribution...

Suppose an x distribution has mean μ = 4. Consider two
corresponding x distributions, the first based on samples of size n
= 49 and the second based on samples of size n = 81. (a) What is
the value of the mean of each of the two x distributions? For n =
49, μ x = For n = 81, μ x = (b) For which x distribution is P( x
> 5) smaller? Explain your answer. The distribution...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 3 minutes ago

asked 18 minutes ago

asked 23 minutes ago

asked 25 minutes ago

asked 26 minutes ago

asked 34 minutes ago

asked 42 minutes ago

asked 45 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago