Question

Suppose x has a distribution with a mean of 90 and a standard deviation of 20. Random samples of size n = 64 are drawn. (a) Describe the distribution. has an approximately normal distribution. has a normal distribution. has a geometric distribution. has a binomial distribution. has an unknown distribution. has a Poisson distribution. Compute the mean and standard deviation of the distribution. (For each answer, enter a number.) = mu sub x bar = = sigma sub x bar = (b) Find the z value corresponding to = 85. (Enter an exact number.) z = (c) Find P( < 85). (Enter a number. Round your answer to four decimal places.) P( < 85) = P(x bar < 85) (d) Would it be unusual for a random sample of size 64 from the x distribution to have a sample mean less than 85? Explain. No, it would not be unusual because more than 5% of all such samples have means less than 85. No, it would not be unusual because less than 5% of all such samples have means less than 85. Yes, it would be unusual because more than 5% of all such samples have means less than 85. Yes, it would be unusual because less than 5% of all such samples have means less than 85.

Answer #1

Suppose x has a distribution with a mean of 80 and a
standard deviation of 45. Random samples of size n = 36
are drawn.
(a)
Describe the distribution.
has a binomial distribution. has an unknown
distribution. has an approximately
normal distribution. has a Poisson distribution. has a normal
distribution. has a geometric distribution.
Compute the mean and standard deviation of the distribution.
(For each answer, enter a number.)
= mu sub x bar =
= sigma sub x bar =
(b)...

Suppose x has a distribution with a mean of 90 and a standard
deviation of 27. Random samples of size n = 36 are drawn. (a)
Describe the x distribution and compute the mean and standard
deviation of the distribution. x has distribution with mean μx =
and standard deviation σx = . (b) Find the z value corresponding to
x = 99. z = (c) Find P(x < 99). (Round your answer to four
decimal places.) P(x < 99)...

Suppose x has a distribution with a mean of 70 and a standard
deviation of 4. Random samples of size n = 64 are drawn.
(a) Describe the x distribution and compute the mean and
standard deviation of the distribution. x has distribution with
mean μx = and standard deviation σx = .
(b) Find the z value corresponding to x = 71. z =
(c) Find P(x < 71). (Round your answer to four decimal
places.) P(x < 71)...

Suppose x has a distribution with a mean of 20 and a standard
deviation of 3. Random samples of size n = 36 are drawn.
Is the sampling distribution of x normal? How do you
know?
What is the mean and the standard deviation of the sampling
distribution of x?
Find the z score corresponding to x = 19.
Find P (x < 19).
Would if be unusual for a random sample of size 36 from the x
distribution to...

What price do farmers get for their watermelon crops? In the
third week of July, a random sample of 45 farming regions gave a
sample mean of = $6.88 per 100 pounds of watermelon.
Assume that σ is known to be $1.92 per 100 pounds.
(a)
Find a 90% confidence interval for the population mean price
(per 100 pounds) that farmers in this region get for their
watermelon crop (in dollars). What is the margin of error (in
dollars)? (For each...

Suppose x has a distribution with μ = 22 and
σ = 20.
(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 μ x = 22
and σ x = 1.3
No, the sample size is too small.
Yes, the x distribution is normal with mean μ x = 22
and σ x = 5
Yes, the x distribution...

6.5-4) Suppose x has a distribution with μ =
39 and σ = 20.
(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 = 39 and
σx = 5.
No, the sample size is too small.
Yes, the x distribution is normal with mean
μx = 39 and
σx = 1.3.
Yes, the x distribution is normal with mean...

a. What is the standard error of a sampling
distribution? (out of the following)
the mean, the probability, the bias, the standard deviation, or
the variance
b. What is the standard deviation of a sampling
distribution called? (out of the following)
the spread, the variance, the standard error, the mean, the
standard variance
c. List two unbiased estimators and their
corresponding parameters. (Select all that apply out of the
following.)
μ is an unbiased estimator for x-bar, p is an...

Suppose x has a distribution with μ = 75 and
σ = 8.
(a) If random samples of size n = 16 are selected, can
we say anything about the x distribution of sample
means?
No, the sample size is too small.Yes, the x
distribution is normal with mean μx =
75 and σx =
0.5. Yes, the x distribution is
normal with mean μx = 75 and
σx = 2.Yes, the x
distribution is normal with mean μx =
75...

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...

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