Question
In: Statistics and Probability
A random sample from a company’s very extensive files shows that orders for a certain piece...
A random sample from a company’s very extensive files
shows that orders for a certain piece of machinery were filled in
12, 10, 17, 14, 13, 18, 11, and 9 days. At the α=0.05 level of
significance, can we reject the claim that on the average such
orders are filled in more than 10 days?
Solutions
orchestra answered 2 years agoRelated Solutions
A random sample of 16 emergency reports was selected from the files of an ambulance service....
A random sample of 16 emergency reports was selected from the
files of an ambulance service. The mean time (computed from the
sample data) required for ambulances to reach their destinations
was 13 minutes. Assume that the population of times is normally
distributed with avariance of 9. Can we conclude at the 0.05 level
of significance that the population mean is greater than 10
minutes? 1. Write the hypotheses, indicate the claim 2. find the
critical value t-value 3. calculate...
The unemployment rate in a certain city is 8.5%. A random sample of 100 people from...
The unemployment rate in a certain city is 8.5%. A random sample
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The unemployment rate in a certain city is 8.5%. A random sample of 100 people from...
The unemployment rate in a certain city is 8.5%. A random sample
of 100 people from the labor force is drawn. Find the probability
that the sample contains at least ten unemployed people.
An investigator takes a random sample of n people from a certain population to obtain the...
An investigator takes a random sample of n people from a certain
population to obtain the proportion p (hitherto unknown to the
researcher) of smokers. Calculate the sample size you should take
to ensure that the proportion of smokers does not differ from the
true p-value by more than 0.01 with a probability of at least 0.95
using:
a) Chebyshev´s inequality
b) Central limit theorem
Compare both values of n obtained, what can you conclude about
it?
An investigator takes a random sample of n people from a certain population to obtain the...
An investigator takes a random sample of n people from a certain
population to obtain the proportion p (hitherto unknown to the
researcher) of smokers. Calculate the sample size you should take
to ensure that the proportion of smokers does not differ from the
true p-value by more than 0.01 with a probability of at least 0.95
using:
b) Central limit theorem
2) A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece...
2) A random sample of 10 miniature Tootsie Rolls was taken from
a bag. Each piece was weighed on a very accurate scale. The results
in grams were:
3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477
-Assuming a normal population, use Minitab to
construct a 95 percent confidence interval for the true mean
weight. You will need to enter the data. Attach or include your
output. (4 points)
-Write a sentence using the confidence interval found in part...
A random sample of 23 chemists from Washington state shows an average salary of $46066 with...
A random sample of 23 chemists from Washington state shows an
average salary of $46066 with a standard deviation of $772. A
random sample of 21 chemists from Florida state shows an average
salary of $40860 with a standard deviation of $772. A chemist that
has worked in both states believes that chemists in Washington make
a different amount than chemists in Florida. At αα=0.05 is this
chemist correct? Let Washington be sample 1 and Florida be sample
2.
The...
A random sample of 15 chemists from Washington state shows an average salary of $46613 with...
A random sample of 15 chemists from Washington state shows an
average salary of $46613 with a standard deviation of $775. A
random sample of 24 chemists from Florida state shows an average
salary of $47757 with a standard deviation of $872. A chemist that
has worked in both states believes that chemists in Washington make
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A poll is conducted in a certain city, regarding a certain referendum A random sample of...
A poll is conducted in a certain city, regarding a certain
referendum A random sample of 100 shows that 62 are IN FAVOR of the
referendum.
(3)CONTINUED Please determine an 80% confidence interval for the
proportion of the population in that city who ARE IN FAVOR of the
referendum.
A simple random sample of 16 adults drawn from a certain population of adults yielded a...
A simple random sample of 16 adults drawn from a certain
population of adults yielded a mean weight of 63kg. Assume that
weights in the population are approximately normally distributed
with a variance of 49. Do the sample data provide sufficient
evidence for us to conclude that the mean weight for the population
is less than 70 kg? Let the probability of committing a type I
error be .01. 1. Write the hypotheses, indicate the claim 2. find
the critical...
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