The income range of attendees at a research conference is gathered as upper, middle, and low levels. What type of data is collected?

Started by Linnea

The sample size is n = 9, σ is not known, and the original population is normally distributed.

Started by Jolyn

An article in a journal reports that 34% of American fathers take no responsibility for child care. A researcher claims that the figure is higher for fathers in the town of Littleton.

Started by Janella

True or False: In a hypothesis test regarding a population mean, the probability of a type II error, β, depends on the true value of the population mean.

Started by Ignacia

True or False: In a hypothesis test, an increase in α will cause a decrease in the power of the test provided the sample size is kept fixed.

Started by Annelle

A nationwide study of American homeowners revealed that 64% have one or more lawn mowers. A lawn equipment manufacturer, located in Omaha, feels the estimate is too low for households in Omaha. Can the value 0.64 be rejected if a survey of 490 homes in Omaha yields 331 with one or more lawn mowers?

Started by Kenyatta

To be able to say with 95% confidence level that the standard deviation of a data set is within 10% of the population's standard deviation, the number of observations within the data set must be greater than or equal to what quantity?

Started by Joann

In a certain population, body weights are normally distributed with a mean of 152 pounds and a standard deviation of 26 pounds. How many people must be surveyed if we want to estimate the percentage who weigh more than 180 pounds?

Started by Graham

A newspaper article about the results of a poll states: "In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 2 percentage points in either direction from what would have been obtained by interviewing all voters

Started by Maryjane

n = 147, x = 59; 90 percent

Started by Audrea

The mean is μ = 60.0 and the standard deviation is σ = 4.0. Find the probability that X is less than 53.0.

Started by Quentin

Biologists monitor the air temperature of the Biosphere 2 in Oracle, Arizona. What type of data is collected?

Started by Kiley

A random sample of 139 forty-year-old men contains 26% smokers. Find the P-value for a test of the claim that the percentage of forty-year-old men that smoke is 22%.

Started by Jonna

Find the P-value for a test of the claim that more than 50% of the people following a particular diet will experience increased energy. Of 100 randomly selected subjects who followed the diet, 47 noticed an increase in their energy level.

Started by Shellie

A hypothesis test is performed to test the claim that a population proportion is greater than 0.7. Find the probability of a type II error, β, given that the true value of the population proportion is 0.72.

Started by Adele

In a clinical study of an allergy drug, 108 of the 202 subjects reported experiencing significant relief from their symptoms.

Started by Jessie

An airline claims that the no-show rate for passengers booked on its flights is less than 6%. Of 380 randomly selected reservations, 18 were no-shows. Find the P-value for a test of the airline's claim.

Started by Junita

An article in a journal reports that 34% of American fathers take no responsibility for child care.

Started by Jenae

A manufacturer considers his production process to be out of control when defects exceed 3%.

Started by Glinda

According to a recent poll 53% of Americans would vote for the incumbent president.

Started by Naida