Suppose the following data are selected randomly from a
population of normally distributed values.
According to the U.S. Bureau of Labor Statistics, the average
weekly earnings of a production worker in July 2011 were $657.49.
Suppose a labor researcher wants to test to determine whether this
figure is still accurate today. The researcher randomly selects 56
production workers from across the United States and obtains a
representative earnings statement for one week from each. The
resulting sample average is $670.76....
A sample of 10 measurements, randomly selected from a
normally distributed population, resulted in a sample mean=5.2, and
sample standard deviation=1.8. Using ,alpha=0.01 test the null
hypothesis that the mean of the population is 3.3 against the
alternative hypothesis that the mean of the population < 3.3, by
giving the following:
degrees of freedom =9
critical t value
the test statistic
A sample of 15 measurements, randomly selected from a normally
distributed population, resulted in a sample mean,
x¯¯¯=6.1 and sample standard deviation s=1.92.
Using α=0.1, test the null hypothesis that μ≥6.4
against the alternative hypothesis that μ<6.4 by giving
the following.
a) The number of degrees of freedom is: df=
.
b) The critical value is: tα= .
c) The test statistic is: ttest=
Suppose the following data are selected randomly from a
population of normally distributed values. 41 51 43 48 44 57 54 39
40 48 45 39 40 Construct a 95% confidence interval to estimate the
population mean.
Suppose that jurors are selected randomly from an adult
population. What is the probability that all 12 jurors are white
when 67% of the population is white? Round you answer to three
decimal places.
A population is normally distributed with muequals200 and
sigmaequals20. a. nbsp Find the probability that a value randomly
selected from this population will have a value greater than 240.
b. Find the probability that a value randomly selected from this
population will have a value less than 190. c. Find the probability
that a value randomly selected from this population will have a
value between 190 and 240.
The weight of a product is normally distributed with a mean 10
ounces. A randomly selected unit of this product weighs 13 ounces.
The probability of a unit weighing more than 13 ounces is 0.0014.
The production supervisor has lost files containing various pieces
of information regarding this process including the standard
deviation. Determine the value of standard deviation for this
process.
1). _________are sample in which the probability of a population
member being selected for the sample is not known?
Probability samples
Simple random samples
Cluster samples
Nonprobability samples
2). Identify the type of sampling for the following. Sixty
percent of the students attending Shujin Academy are female. I
construct a random sample that consists of 60% of females from the
student population to ask what their opinions are of the Academy’s
food service.
Simple random sampling
Systematic sampling
Cluster sampling...
A population is normally distributed with
muμequals=100100
and
sigmaσequals=2525.
a. nbspa.
Find the probability that a value randomly selected from this
population will have a value greater than
115115.
b.
Find the probability that a value randomly selected from this
population will have a value less than
9090.
c.
Find the probability that a value randomly selected from this
population will have a value between
9090
and
115115.
LOADING...
Click the icon to view the standard normal table.
a. P(xgreater...
A population is normally distributed with μ=300 and σ=20.
A. Find the probability that a value randomly selected from this
population will have a value greater than 345
B. Find the probability that a value randomly selected from this
population will have a value less than 295
C. Find the probability that a value randomly selected from this
population will have a value between 295 and 345
Click the icon to view the standard normal table.
A. P( x >...