True or False: A cell phone company believes that 90 percent of its customers are satisfied...
True or False: A cell phone company believes that 90 percent of its customers are satisfied with their service. They survey n = 30 customers. Based on this, it is acceptable to assume the sample distribution is normally distributed.
Homework Answers
For sample distribution to be assumed as approximately normal, the conditions are
(a) np 
5
(b) n(1-p) 5
here, n = 30
p = 0.90
np = 30x0.9 = 27
n(1-p) = 30x(1-0.9) = 3
n(1-p) < 5. Condition (b) is not satisfied here
So, we cannot assume the sample distribution is normally distributed
Add Answer to:
True or False: A cell phone company believes that 90 percent of
its customers are satisfied...
A telephone service representative believes that the proportion of customers completely satisfied with their local telephone...
A telephone service representative believes that the proportion of customers completely satisfied with their local telephone service is different between the Northeast and the Midwest. The representative's belief is based on the results of a survey. The survey included a random sample of 920 northeastern residents and 840 midwestern residents. 54% of the northeastern residents and 44% of the midwestern residents reported that they were completely satisfied with their local telephone service. Find the 90% confidence interval for the difference...
A telephone service representative believes that the proportion of customers completely satisfied with their local telephone...
A telephone service representative believes that the proportion of customers completely satisfied with their local telephone service is different between the Midwest and the West. The representative's belief is based on the results of a survey. The survey included a random sample of 780 midwestern residents and 660 western residents. 42% of the midwestern residents and 37% of the western residents reported that they were completely satisfied with their local telephone service. Find the 98% confidence interval for the difference...
4. As the newly hired manager of a company that provides cell phone service, you want...
4. As the newly hired manager of a company that provides cell phone service, you want to determine the percentage of adults in your state who live in a household with cell phones and no land-line phones. How many adults must you survey? Assume that you want to be 90% confident that the sample percentage is within three percentage points of the true population percentage. Use STATCRUNCH to calculate the following Sample Size. a. Assume that nothing is known about...
A hotel claims that 91% of its customers are very satisfied with its service. Complete parts...
A hotel claims that 91% of its customers are very satisfied with its service. Complete parts a through d below based on a random sample of 10 customers. Binomial Distribution. (4 points) MUST use the Binomail Distribution function BINOM.DIST() function. Provide your final answer rounded to 4 decimal places in the yellow highlight cell. a) What is the probability that 6 customers are very satisfied? b) What is the probability that more than 6 customers are very satisfied? c) What...
telephone service representative believes that the proportion of customers completely satisfied with their local telephone service...
telephone service representative believes that the proportion of customers completely satisfied with their local telephone service is different between the Northeast and the South. The representative's belief is based on the results of a survey. The survey included a random sample of 900 northeastern residents and 760 southern residents. 43% of the northeastern residents and 57% of the southern residents reported that they were completely satisfied with their local telephone service. Find the 99% confidence interval for the difference in...
If 82 out of 174 customers are somewhat or very satisfied with your customer service, then...
If 82 out of 174 customers are somewhat or very satisfied with your customer service, then what is p, the sample proportion? If you make a 95% confidence interval, what is the parameter you are estimating? Oo Op Op (Rho, the lower-case Greek r) If you want to compute a 95% confidence interval for the parameter, what are the assumptions that must be true? Othe original variable is normally distributed On2 30 On*p is large AND n*(1-p) is large (at...
An automobile manufacturer would like to know what proportion of its customers are not satisfied with...
An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by the local dealer. The customer relations department will survey a random sample of customers and compute a 96% confidence interval for the proportion who are not satisfied. Past studies suggest that this proportion will be about 0.29. Find the sample size needed if the margin of the error of the confidence interval is to be about 0.01. (You will need...
Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is...
Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 24.3 months. The standard deviation is 2.6 months. If a company provides its 32 employees with a cell phone, find the probability that the mean lifetime of these phones will be less than 23.7 months. Assume cell phone life is a normally distributed variable, the sample is taken from a large population and the correction factor can be ignored. Round the final answer to...
True or False: Research by TARP Worldwide, Inc. found that a full 96 percent of customers...
True or False: Research by TARP Worldwide, Inc. found that a full 96 percent of customers who report being “very satisfied” (i.e., they are in the “top box” in satisfaction) say they will “definitely repurchase” from the same company.
3.2905 An automobile manufacturer would like to know what proportion of its customers are not satisfied...
3.2905 An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by the local dealer. The customer relations department will survey a random sample of customers and compute a 99.9% confidence interval for the proportion who are not satisfied. (a) Past studies suggest that this proportion will be about 0.19. Find the sample size needed if the margin of the error of the confidence interval is to be about 0.01. (You...
4. As the newly hired manager of a company that provides cell phone service, you want to determine the percentage of adults in your state who live in a household with cell phones and no land-line phones. How many adults must you survey? Assume that you want to be 90% confident that the sample percentage is within three percentage points of the true population percentage. Use STATCRUNCH to calculate the following Sample Size. a. Assume that nothing is known about...
A hotel claims that 91% of its customers are very satisfied with its service. Complete parts a through d below based on a random sample of 10 customers. Binomial Distribution. (4 points) MUST use the Binomail Distribution function BINOM.DIST() function. Provide your final answer rounded to 4 decimal places in the yellow highlight cell. a) What is the probability that 6 customers are very satisfied? b) What is the probability that more than 6 customers are very satisfied? c) What...
If 82 out of 174 customers are somewhat or very satisfied with your customer service, then what is p, the sample proportion? If you make a 95% confidence interval, what is the parameter you are estimating? Oo Op Op (Rho, the lower-case Greek r) If you want to compute a 95% confidence interval for the parameter, what are the assumptions that must be true? Othe original variable is normally distributed On2 30 On*p is large AND n*(1-p) is large (at...
Most questions answered within 3 hours.
-
The labor force minus the number of employed equals the number
of unemployed.
a. True
b....
asked 52 minutes ago -
Determine the mass in units of grams [g] of 0.49 moles [mol]
of a new fictitious...
asked 1 hour ago -
A horizontal mass of M=5kg is on a spring and stretched to
x=0.5m when released from...
asked 2 hours ago -
26 of 50
"I have worked at the Arizona Humane Society for ten years, and
have...
asked 2 hours ago -
Compare and contrast zero based budgeting and incremental (or
base year) budgeting.
asked 2 hours ago -
4 pts 10. Which of the following hypothesis would be MOST
difficult to test experimentally? Group...
asked 2 hours ago -
A business owner makes 1,000 items a day. Each day he or she
contributes eight hours...
asked 2 hours ago -
A
circular loop in the plane of a paper lies inca0.65 T magnetic
field pointing into...
asked 3 hours ago -
A business owner is trying to decide whether to buy, rent, or
lease office space and...
asked 3 hours ago -
Thermal Storage Solar heating of a house is much more efficient
if there is a way...
asked 3 hours ago -
Considering the “fits” for group and job design dimensions,
suppose you had 12 employees with different...
asked 3 hours ago -
Consider TCP connection management.
How many segments are typically involved in the TCP connection
establishment? What...
asked 3 hours ago