Question

2) A random sample of ?? = 15 summer days in Los Angeles gave a sample mean pollution index of ?? = 40. Previous studies show that ?? = 15. For San Francisco, a random sample of ?? = 19 summer days gave a sample mean pollution index of ?? = 44. Previous studies show that ?? = 12. Assume the pollution index is normally distributed. Do these data indicate the mean population pollution index of San Francisco is different from that of Los Angeles? Use a 1% level of significance.

Step One: State the Hypotheses

Step Two: Calculate the Test Statistic

Step Three: Find the P-value

Step Four: Decision (compare the p-value to alpha)

Step Five: Conclusion (be sure this is in complete sentence form)

Answer #1

2) A random sample of ?? = 15 summer days in Los Angeles gave a
sample mean pollution index of ?? = 40. Previous studies show that
?? = 15. For San Francisco, a random sample of ?? = 19 summer days
gave a sample mean pollution index of ?? = 44. Previous studies
show that ?? = 12. Assume the pollution index is normally
distributed. Do these data indicate the mean population pollution
index of San Francisco is different...

A random sample of n1 = 10 winter days in
Denver gave a sample mean pollution index x1 =
43. Previous studies show that σ1 = 21. For
Englewood (a suburb of Denver), a random sample of
n2 = 12 winter days gave a sample mean
pollution index of x2 = 36. Previous studies
show that σ2 = 13. Assume the pollution index
is normally distributed in both Englewood and Denver.
(a) Do these data indicate that the mean population...

A random sample of 16 winter days in Denver gave a sample mean
pollution index of 43 with a standard deviation of 16. For
Englewood (a suburb of Denver), a random sample of 17 winter days
gave a sample mean pollution index of 51 with a standard deviation
of 13. Do these data indicate that the mean population pollution
index of Englewood is different (either way) from that of Denver in
the winter? Use a 1% level of significance. show...

A random sample of n1 = 14 winter days in
Denver gave a sample mean pollution index x1 =
43. Previous studies show that σ1 = 21. For
Englewood (a suburb of Denver), a random sample of
n2 = 12 winter days gave a sample mean
pollution index of x2 = 37. Previous studies
show that σ2 = 17. Assume the pollution index
is normally distributed in both Englewood and Denver.
(a) Do these data indicate that the mean population...

A researcher wished to compare the average daily hotel room
rates between San Francisco and Los Angeles. The researcher
obtained an SRS of 15 hotels in downtown San Francisco and found
the sample mean x1=$156 , with a standard deviation s1= $15 . The
researcher also obtained an independent SRS of 10 hotels in
downtown Los Angeles and found the sample mean x2= $143, with a
standard deviation s2=$10.
Let 1 and 2 represent the mean cost of the populations...

1) Male athletes at Eastern Michigan University have a
graduation rate of 71%. Over the past several years, a random
sample of 42 male athletes at EMU showed that 24 eventually
graduate. Does this indicate the population proportion of male
athletes who graduate from EMU is now less than 71%? Use a 1% level
of significance.
Step One: State the Hypotheses
Step Two: Calculate the Test Statistic
Step Three: Find the P-value
Step Four: Decision (compare the p-value to alpha)...

A simple random sample of size n=15 is drawn from a population
that is normally distributed. The sample mean is found to be bar
over x=19.5
and the sample standard deviation is found to be s=6.3.
Determine if the population mean is different from 25 at the
alpha=.01 level of significance.
A) Determine the null and alternative hypotheses
H0: ___ ____ 25
H1: ____ ____ 25
B) Calculate the p value
C) State conclusion. Reject or not reject? Is there...

A random sample of 100 observations from a quantitative
population produced a sample mean of 21.5 and a sample standard
deviation of 8.2. Use the p-value approach to determine whether the
population mean is different from 23. Explain your conclusions.
(Use α = 0.05.) State the null and alternative hypotheses. H0: μ =
23 versus Ha: μ < 23 H0: μ = 23 versus Ha: μ > 23 H0: μ = 23
versus Ha: μ ≠ 23 H0: μ <...

A simple random sample of size n= 15 is drawn from a
population that is normally distributed. The sample mean is found
to be x overbar equals31.1 and the sample standard deviation is
found to be s= 6.3. Determine if the population mean is
different from 26 at the alpha equals 0.01 level of significance.
Complete parts (a) through (d) below.
(a) Determine the null and alternative hypotheses.
(b) Calculate the P-value.
(c) State the conclusion for the test.
(d) State the...

Suppose a random sample of 12 male runners of college-age gave a
mean weight of 151 lbs with a standard deviation of 9 lbs. We would
like to know whether or not the population from which this sample
was selected has a lower mean weight than 160 lbs
which is the mean weight of the population of college-aged males as
a whole.
The value of the t-statistic for testing the hypotheses of
interest is t = -3.5. What is the...

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