Three defective electric toothbrushes were accidentally shipped to a drugstore by Cleanbrush Products along with 17 nondefective ones. a. What is the probability the first two electric toothbrushes sold will be returned to the drugstore because they are defective? Show all work, the formula and answer ...continues
A survey of top executives revealed that 35% of them regularly read Time magazine, 20% read Newsweek, and 40% read US News and World Report. Ten percent read both Time and US News and World Report. a)What is the probablility that a particular top executive reads either Time or US News and World Report regularly? Show th ...continues
A normal distribution has a mean of 50 and a standard deviation of 4.
A normal distribution has a mean of 50 and a standard deviation of 4. a) Compute the probability of a value between 44.0 and 55.0 Show your work and answer here excel format b) Compute the probability of a value greater than 55.0 Show your work and answer here excel format c) Compute the pro ...continues
According to an IRS study, it takes an average of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time to prepare, copy, and electronically file form 1040 is 80 minutes. a)What assump ...continues
Chicken Delight claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time. At the 0.10 significance level, can we conclude that less than 90% of the orders are delivered in less than 10 minutes? Please answer ...continues
Cellon, a manufacturer of a home insulation, wants to develop guidelines for builders and consumers regarding the effects (1) of the thickness of the insulation in the attic of a home and (2) of the outdoor temperature on natural gas consumption. In the laboratory they varied the insulation thickness and temperature. Please ...continues
The following sample observations were randomly selected.
The following sample observations were randomly selected. Determine the coefficient of correlations and the coefficient of determination. Interpret the association between X and Y. Please show all work in excel format
Neilsen Media Research wants to pretest a questionnaire to be mailed to several thousand viewers. One question involves the ranking of male and female college students with respect to the popularity of programs. The composite rankings of a small group of college students are: (See attached file for full problem description) ...continues
The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number of h ...continues
The Tampa bay (Florida) Area Chamber of Commerce wanted to know whether the mean weekly salary of nurses was larger than that of school teachers. To investigate, they collected the following information on the amounts earned last week by a sample of school teachers and nurses. Questions: Is it reasonable ...continues
