1) Calculate a point estimate and a 95% confidence interval of the mean. Assuming your data set is normally distributed, determine an appropriate sample size if the maximum allowable error is three units for the attached data set. (Please note: the three units are measure in the unit of measurement of the attached data set eg. hours, pounds, dollars). Use a 90% confidence level to determine the sample size.

2) Interpret the relationship between the level of confidence and the width of the confidence interval.

This solution shows step-by-step to calculate a point estimate and confidence interval of the mean, it also provides a justified interpretation of the relationship between the level of confidence and width of confidence interval.

Discuss what happens to the width of the confidenceinterval as the sample size is decreased. Discuss what happens to the width of the confidenceinterval as the confidencelevel is increased. Is this reasonable? Explain.

3. in an effort to estimate the annual income for new graduates, data were collected from 500 new graduates over a one -year period. assume a population standard deviation of $500.
a) if the sample mean is $15,000, what is the 95% confidenceinterval for the population mean?
b) if the sample mean is $15,000, what is the 98

A sample of n=16 scores is obtained from an unknown population. The sample has a mean of M=46 with SS=6000.
a. Use the sample data to make an 80% confidenceinterval estimate
of the unknown population mean.
b. Make a 90% confidenceinterval estimate of μ.
c. Make a 95% confidenceinterval estimate of μ.

* The UNITE/MORI 2004 survey of student experiences estimated that university students in the UK paid on average $54 per week in accommodation costs.
Assume that this average is based on a sample 755 students and that the population standard deviation for weekly accommodation costs is $ 11.
a. Construct a 90 per cent confi

I am having problems with these sample problems. Can you please help me? I have attached the following questions within an excel sheet for your usage in deriving the solutions.
A 90 % confidenceinterval for a situation is developed and is given by the following 48 < ยต < 64.
a) Give the value of the sample mean that was us

1 ) Management has asked a lab to produce accurate results at the 88% level for a first time experiment. the management wants the final error to be within 1/10th of the sample standard deviation. Find the sample size.
2) A sample of 16 women had a mean score of 275 and a variance value of 360.
A. find both the 955 and 99

A random sample a 16 Google managers yield the following information on annual salaries. The sample mean is $69,000, with a sample standard deviation of $4,000. What is the mean salary of all Google managers? What is the 95% confidenceinterval for the population mean?
Confidenceinterval - mean
95%

Which of the following is not needed to be known to calculate a confidenceinterval?
a. standard deviation
b. sample size
c. mean
d. degree of confidence

I need help solving 95% confidenceintervaland point estimate problems.
A sample of 16 people are used, each one is to keep track of their time with the following result in hours.
1.8, 1.7, 0.9, 1.1, 1.5, 1.5, 1.2, 0.6, 1.4, 0.9, 0.7, 1.8, 1.7, 2.2, 1.5, 1.3
Construct a 95% confidenceinterval for the amount of time n