Question
In: Math
A simple random sample of 70 customers is taken froma customer information file and the average...
A simple random sample of 70 customers is taken froma customer information file and the average age is 36. The population standard deviation o is unknown. Instead the sample standard deviation s is also calculated from the sample and is found to be 4.5. 2. Test the hypothesis that the population mean age is greater than 33 using the critical value approach and a 0.05 level of significance. а. Test the hypothesis that the population mean age is less than 38 using the p- value approach and a 0.05 level of significance. b. Test the hypothesis that the population mean age is different from 32 using the p-value approach and a 0.05 level of significance. с.
Solutions
milcah answered 5 months agoRelated Solutions
simple random sample of 80 customers is taken from a customer information file and the average...
simple random sample of 80 customers is taken from a customer
information file and the average age is 34. The population standard
deviation σ is unknown. Instead the sample standard deviation s is
also calculated from the sample and is found to be 5.5. (6
points)
Test the hypothesis that the population mean age is greater
than 30 using the critical value approach and a 0.05 level of
significance.
Test the hypothesis that the population mean age is less than...
A simple random sample of 20 customers is taken from a customer information file and the...
A simple random sample of 20 customers is taken from a customer
information file and the average age is 27. The sample standard
deviation s is found to be
5.
(5 marks)
Test the hypothesis that the population mean age is less than
29 using the critical value approach and a 0.10 level of
significance.
Test the hypothesis that the population mean age is different
from 30 using the 0.05 level of significance.
A simple random sample of 20 customers is taken from a customer information file and the...
A simple random sample of 20 customers is taken from a customer
information file and the average age is 27. The sample standard
deviation s is found to be
1.5.
(5 marks)
Test the hypothesis that the population mean age is less than
29 using the critical value approach and a 0.10 level of
significance.
Test the hypothesis that the population mean age is different
from 30 using the 0.05 level of significance.
.
A random sample of 29 lunch customers was taken at a restaurant The average amount of...
A random sample of 29 lunch customers was taken at a restaurant
The average amount of time the customers in the sample stayed in
the restaurant was 45 minutes with a standard deviation of 14
minutes.
a) Compute the standard error of the mean?
b) Construct a 68% confidence interval for the true average
amount of time customers spent in the restaurant?
c) Construct a 90% confidence interval for the true average
amount of time customers spent in the restaurant?...
A random sample of 49 lunch customers was taken at a restaurant. The average amount of...
A random sample of 49 lunch customers was taken at a restaurant.
The average amount of time these customers stayed in the restaurant
was 45 minutes with a standard deviation of 14 minutes.
a. Compute the standard error of the mean.
b. Construct a 95% confidence interval for the true average
amount of time customers spent in the restaurant.
c. With a .95 probability, how large of a sample would have to
be taken to provide a margin of error...
A random sample of 49 lunch customers was taken at a restaurant. The average amount of...
A random sample of 49 lunch customers was taken at a
restaurant. The average amount of time these customers stayed in
the restaurant was 45 minutes with a sample standard deviation of
14 minutes.
Compute the standard error of the mean.
At 95% confidence, what is the confidence interval
estimate?
Construct a 99% confidence interval for the true average amount
of time customers spent in the restaurant.
Compare the margin of errors and width of your confidence
intervals from parts...
The manager of a grocery store has taken a random sample of 100 customers. The average...
The manager of a grocery store has taken a random sample of 100
customers. The average length of time it took the customers in the
sample to check out was 4.8 minutes with a sample standard
deviation of 0.5 minutes. Conduct a test to determine whether or
not the mean waiting time of all customers is significantly more
than 5 minutes. Use a significance level of α = 0.01.
A simple random sample of 70 Stat 20 students is taken from my class of 340...
A simple random sample of 70 Stat 20 students is taken from my
class of 340 students; the average number of units these students
is taking is 16.1, with an SD of 1.9. Last spring I taught a
smaller class with only 96 students, and those 96 students took an
average number of units of 15.5, with an SD of 2.2. Do a hypothesis
test to decide whether the average number of units for this
semester's Stat 20 class is...
A simple random sample of 70 items resulted in a sample mean of 60. The population...
A simple random sample of 70 items resulted in a sample mean of
60. The population standard deviation is σ = 15.
(a) Compute the 95% confidence interval for the population mean.
(Round your answers to two decimal places.)
_________ to _________
(b) Assume that the same sample mean was obtained from a sample
of 140 items. Provide a 95% confidence interval for the population
mean. (Round your answers to two decimal places.)
_________ to _________
(c) What is the...
A simple random sample of 70 items from a population with = 9 resulted in a sample...
A simple random sample of 70 items from a population
with = 9 resulted in a sample mean of 37.
If required, round your answers to two decimal
places.
a. Provide a 90% confidence interval for the
population mean. _______ to _______
b. Provide a 95% confidence interval for the
population mean. _______ to _______
c. Provide a 99% confidence interval for the
population mean. _______ to _______
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Which subnet (network address) does host 25.17.102.51 255.255.248.0 belong to?
- Joe Dokes retired today with $1,000,000 in his retirement nest egg. If he followed a cash...
- how is biopsychosocial compatiable model in the future.
- Give at least 5 nursing interventions (with rationale) of nursing diagnosis: Health-seeking behaviors related to patient’s...
- The Wall Street Wizard Co. sold a stock market investing plan through the mail that made...
- Rotating bits in C This rotates bits to the left which means the bits that were...
- Implement a method that meets the following requirements: (a) Takes as parameter 1) an int array...
ADVERTISEMENT