Question

A sample of ?=24 observations is drawn from a normal population with ?=1000 and ?=240. Find each of the following:

A. ?(?¯>1097)

Probability =

B. ?(?¯<906)

Probability =

C. ?(?¯>990)

Probability =

Answer #1

A sample of n=15 observations is drawn from a normal population
with μ=1060 and σ=150. Find each of the following:
A. P(X¯>1137)
Probability =
B. P(X¯<982)
Probability =
C. P(X¯>1009)
Probability =

A sample of n=23 observations is drawn from a normal population
with μ=960 and σ=160. Find each of the following:
A. P(X¯>1013)
I have a general idea of how to get the z- score, but am having
trouble moving forward from there.

Let the following sample of 8 observations be drawn from a
normal population with unknown mean and standard deviation: 23, 26,
22, 20, 16, 21, 25, 24. [You may find it useful to
reference the t table.]
a. Calculate the sample mean and the sample
standard deviation. (Round intermediate calculations to at
least 4 decimal places. Round "Sample mean" to 3 decimal places and
"Sample standard deviation" to 2 decimal places.)
b. Construct the 90% confidence interval for
the population...

A random sample of n=36 observations is drawn from a population
with a mean equal to 60 and a standard deviation equal to 36.
a. Find the probability that x? is less than 48 ____
b. Find the probability that x? is greater than 63____
c. Find the probability that x? falls between 48 and 78 ____

A random sample of 25 observations is to be drawn from a
population with the mean of 40 and a standard deviation of 25. The
probability that the mean of the sample will exceed 45 is:
a.Not possible to compute
b. 0.4772
c. 0.4207
d. 0.0228

If the random variable X is drawn from a normal population with
?=155 and ?=11, find each of the following:
A. ?(?>168)
Probability =
B. ?(?<136)
Probability =
C. ?(150<?<160)
Probability =

14. A sample of size 82 will be drawn from a population with
mean 24 and standard deviation 9
.a. Find the probability that will be less than 26

Let the following sample of 8 observations be drawn from a
normal population with unknown mean and standard deviation: 16, 26,
20, 14, 23, 10, 12, 29. [You may find it useful to
reference the t table.]
a. Calculate the sample mean and the sample
standard deviation. (Round intermediate calculations to at
least 4 decimal places. Round "Sample mean" to 3 decimal places and
"Sample standard deviation" to 2 decimal places.)
b. Construct the 95% confidence interval for
the population...

A random sample of n=81 observations is drawn from a population
with a mean equal to 57 and a standard deviation equal to 54, find
the probability if x is less than 51, x is greater than 66, and if
x falls between 51 and 63

A sample of 10 observations is selected from a normal population
for which the population standard deviation is known to be 4. The
sample mean is 24. (Round your answers to 3 decimal
places.)
(a)
The standard error of the mean is .
(c)
The 99 percent confidence interval for the population mean is
between ___ and ___.

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