Confident Interval Essay

17) Imagine a survey that asks 1,000 married and divorced respondents whether they ever cheated on their spouse, and 950 people respond. One major problem with such a survey could be its:

Determine the minimum sample size required to construct a 95% confidence interval for the population mean.  Assume the population's standard deviation is .2 inches.

g. Construct a 97% confidence interval estimate of the population proportion of all organic tea bags produced by Ryerson Inc., which have more than 5.00 gram.

12. _____ For a given population, confidence intervals constructed from larger samples tend to be narrower than those constructed from smaller samples. Which statement below best describes why this is true? (A) The variability of the sample mean is less for larger samples. (B) The z-value for larger samples tends to be more accurate. (C) The population variance is larger for large populations. (D) As the sample size increases, the z-value (or t-value) becomes smaller. A machine dispenses potato chips into bags that are advertised as containing one pound of product. To be on the safe side, the machine is supposed to be calibrated to dispense 16.07 ounces per bag, and from long time observation, the distribution of the fill-weights is known to be approximately normal and the process is known to have a standard deviation of 0.15 ounces.

Population A and Population B both have a mean height of 70.0 inches with an SD of 6.0. A random sample of 30 people is picked from population A, and random sample of 50 people is selected from Population B. Which sample mean will probably yield a more accurate estimate of its population mean? Why? Despite, both Population A and Population having a mean height of 70.0 inches with an SD of 6.0, Population B will

1. The table below presents data for a sample of people who completed a religious survey.

If the CEO wants to have 95.44 percent confidence that the estimates of awareness and positive image are within +/- 2 percent of true value, the required sample size should be 2221. I came up with that answer by doing the following:

a) Does the range rule of thumb overestimate or underestimate the standard deviation for the number of people living in your home? Q17

9. Assume you want to estimate with the proportion of students who commute less than 5 miles to work within 2%, what sample size would you need?

AJ Davis is a department store chain, which has many credit customers and wants to find out more information about these customers. The total sample set of 50 credit customers is selected with data collected.

Average household size is about 3.4. Based on the graph above, 15 of the 50 sampled have a

An estimated 36.5 million or 15.1 % of adults aged 18 years old and older currently smoke cigarettes and more than 16,000,000 have smoking or live with diseases that are related to smoking. According to US department of health and human services, over the past five decades, there is a significant decline in cigarette smoking in the U.S. The progress has slowed in recent years and the prevalence of use of other tobacco products such as vapes, e-cigars and smokeless tobacco

e.) Find a 95% confidence interval for the proportion who stay with D&Y for at least 3 years but this time with starting salaries above the median.

For each of the following three populations, indicate what the sampling distribution for samples of 25

A market research firm needs to find 100 people who regularly purchase orange juice to complete a survey on a new line of frozen orange juice. After talking to a random sample of 500 people, 75 orange juice buyers have been found. Based upon this information, how many additional people in a random sample do they need to interview to reach an expected total of 100 people who regularly purchase orange juice? TASK 2 – UNISOAP CASE As a Client Service Executive at Nielsen, you are assigned to work on Sudsy Soap Company’s client team.