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Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed the mean age to be 9.2 years. The st
The annual turnover rate of the 200-count bottle of aspirin follows the normal distribution with a mean of 6.0 and a standard deviation of 0.50. (This indicates that the stock of asprin turns over o
The annual turnover rate of the 200-count bottle of aspirin follows the normal distribution with a mean of 6.0 and a standard deviation of 0.50.
A registrar wants to estimate the arithmetic mean grade point average (GPA) of all graduating seniors during the past 10 years. GPA range between 2 and 4. The mean GPA is to be estimated within plus
A study of church contributions revealed that 15 of 40 families sampled attend church regularly. Make the 95 percent confidence interval for the proportion of families attending church regularly. Sh
A market survey was conducted to estimate the proportion of homemakers who would recognize the brand name of a cleanser based on shape and colour of the container. Of the 1, 4000 homemakers sampled,
A market survey was conducted to estimate the proportion of homemakers who would recognize the brand name of a cleanser based on the shape and colour of the container. Of the 1, 4000 homemakers samp
Is it reasonable to conclude that the typical worker does not miss any days during a pay period.
describes why the t distribution is used as a part of the confidence interval.Is it reasonable to end that the typical worker does not miss any days during a pay period.
A lady sells homemade bread at 50 locations in town. She is concerned about absenteeism with the workers. Below is the number of days for a sample of 10 workers for the last 2 week pay period.
Lauren Moore has sold her business for $500,000 and wish to spend in condominium units (which she intends to rent) and land (which she will lease to farmer). She estimates that she will get an annua
The mean daily sales at the Stop and Go are $20,000 for a sample of 40 days. The standard deviation of the sample is $3,000.
The Gibbs Baby Food Company wishes to compare the weight gain of infants using their brand versus their competitor's brand. A sample of 40 babies using Gibbs products revealed a mean weight gain of
Assume the USGA wants to compare the mean distances associated with the 4 different brands of golf balls when struck with driver.
A sample of 40 observations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second population. The samp
A candy company wants to identify whether or not the size of it's' candy bars are the same length from one day to another. On day 1 they sample 52 candy bars with an average mean of 5.40 inches and
The following frequency distribution reports number of frequent flier miles, reported in the thousands, for employees of Brumley Statistical Consulting, Inc. throughout the first quarter of 2004.
A school district wants to determine if the girls are equal to boys in test scores. They took a random sample of 22 8th grade girls and 24 8th grade boys. The district looked at recent CAT scores an
Employ job classification is ordinal (clerical < technical professional) find out if males and females have different levels of job classification. Phrase your results
The standard deviation of math test scores at one high school is 16.6. A teacher claims that the standard deviation of the girl's test scores is smaller than 16.1. A random sample of 22 girls result
A new machine has just been installed to the cut and rough-shape large slugs. The slugs are then transferred to precision grinder.
Make use of the traditional method to test the given hypothesis. Assume that the population is the normally distributed and that the sample has been randomly selected.