Download ch 7 around the room

The ages of six members of a board of directors of a
nonprofit organization are shown below.
How many samples of size 2 can be made from this
group of people?
67
A survey was performed on Antioch students (1500
total) and the time it takes to complete their
homework as the variable of interest. Mr. G
performed a census and found a mean of 50 minutes
and a standard deviation of 15 minutes. What is the
mean of all possible sample means of size 20?
15
A survey was performed on Antioch students (1500 total)
and the time it takes to complete their homework as the
variable of interest. Mr. G performed a census and found
a mean of 50 minutes and a standard deviation of 15
minutes. What is the sample mean standard deviation for
samples of size 9.
50
What happens to the standard deviation as the sample
size gets larger?
5
What kind of curve is this?
decreases
What is the formula for the standard deviation of a
sample mean distribution?
Left Skewed
According to the Empirical Rule, what percentage of data
lie within 3 standard deviations of the mean?
What happens to the sampling error if you decrease your
sample size?
99.7
As the sample size increases, what happens to the mean
of all possible samples?
increases
Draw a bimodal curve.
Stays the same
Suppose that a population consists of five players that
start on a basketball team given in the table. Find the
population mean.
Player
Derrick
Rose
Dwyane
Wade
Lebron
James
Height
76
78
79
Amare
Dwight
Stoudemi Howard
re
81
86
Suppose that a population consists of five players that start
on a basketball team given in the table. Find the standard
deviation( hint: use the list feature on the ti 83/84). *round to
one decimal place
Player
Derrick
Rose
Dwyane
Wade
Lebron
James
Height
76
78
79
80
Amare
Dwight
Stoudemi Howard
re
81
86
A population of Test Scores has a mean of 90 and a
standard deviation of 15. Samples of size n = 25 are
drawn randomly from the population. Determine the
percentage of all samples of size 25 that have a mean
within 2.5 of the population mean. *round to the
nearest percent
3.8
The length of time, in hours, it takes an "over 40" group of
people to play one soccer match is normally distributed with
a mean of 2 hours and a standard deviation of 0.5 hours. A
sample of size n = 50 is drawn randomly from the
population. Determine the percentage of all samples of size
50 that have a sample error of at most .15 hours. *round to
the nearest percent
60
The test scores of 5 students are under consideration. The following is the dotplot
for the sampling distribution of the sample mean for samples of size 2.
Find the probability, expressed as a percent, that the sample mean will be equal to
the population mean.
97
20
100
false
The mean height for a population is 65 inches and the standard deviation is 3.
Let A and B denote the events described below.
Event A The mean height in a random sample of 16 people is within 1 of the
population mean.
Event B The mean height in a random sample of 50 people is within 1 of the
population mean.
Which event has a higher probability?
true
What function on the calculator helps you find probabilities
for normal distributions?
B
If I say your grade is within 5 percent of 85, is it possible for
your grade to be exactly 80 percent?
normalcdf(min,max,mean,sd)
How many ways can I give out gold, bronze and silver award
to three out of 10 people?
yes
The ages of six members of a board of directors of a nonprofit
organization are shown below.
Consider these board members to be a population of interest. The
mean age, μ, for the population is 47.
Find the probability as percent that a sample mean of size 5 will be
within 2 years of the population mean.
720