Con?dence interval for proportion of people

Reference no: EM13968633

1. A maker of portable exercise equipment, designed for health-conscious people who travel too frequently to use a regular athletic club, wants to estimate the proportion of traveling business people who may be interested in the product. A random sample of 120 traveling business people indicates that 28 may be interested in purchasing the portable ?tness equipment. Give a 95% con?dence interval for the proportion of all traveling business people who may be interested in the product.

2. The makers of a medicated facial skin cream are interested in determining the percentage of people in a given age group who may bene?t from the ointment. A random sample of 68 people results in 42 successful treatments. Give a 99% con?dence interval for the proportion of people in the given age group who may be successfully treated with the facial cream.

Reference no: EM13968633

Questions Cloud

Con?dence interval for proportion of ?lled mba : Assuming that these numbers are exact and that the sample was randomly chosen from the entire population of interest, give a 90% con?dence interval for the proportion of ?lled MBA positions in Europe.

Are the goals of the research clearly stated : Examine graphs and data tables, are there trends or results that you notice that are not mentioned in the text? Why not? Should they be? Would they change any of the conclusions or other statements the authors have made?

Con?dence interval for population proportion : According to BusinessWeek, many Japanese consider their cell phones toys rather than tools.14 If a random sample of 200 Japanese cell phone owners reveals that 80 of them consider their device a toy, calculate a 90% con?dence interval for the pop..

What to avoid in a negative message : After reading chapter 17 in the e-book, write two substantive paragraphs on what to avoid in a negative message and what to maintain

Con?dence interval for proportion of people : Give a 99% con?dence interval for the proportion of people in the given age group who may be successfully treated with the facial cream.

Consumption of fuel by a delivery truck : The data on the daily consumption of fuel by a delivery truck, in gallons, recorded during 25 randomly selected working days, are as follows:

Con?dence interval for average daily demand for milk : The following data are available (number of half-gallon containers sold per day): 48, 59, 45, 62, 50, 68, 57, 80, 65, 58, 79, 69. Assuming that this is a random sample of daily demand, give a 90% con?dence interval for average daily demand for mil..

Average number of years of experience : A random sample of 28 executives gives x = 6.7 years and s = 2.4 years. Give a 99% con?dence interval for the average number of years of experience for all executives in this branch.

Estimate the average amount of an account : An accountant wants to estimate the average amount of an account of a ser- vice company. A random sample of 46 accounts yields x = $16.50 and s = $2.20. Give a 95% con?dence interval for the average amount of an account.

User Account

All Pages