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Determine what would happen to your critical value (Z) if you were to change the level of significance (a) from .05 to .1 in a two tailed hypothesis test.
According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia.
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
A machine produces 3 inch nails. A sample of 10 nails was selected and the lengths determined:
All Seasons Plumbing has two service trucks which frequently break down. If the probability the first truck is available is .75
A researcher claims that the average age of a woman before he has her first child is now greater than it was in 1990.
Suppose a candidate running for sheriff claims that she will reduce the average speed of emergency response to less than 3o minutes.
The NCAA requires colleges to report the graduation rates of their athletes. At one large university 70.7% of all students who entered between 1989 and 1991
A researcher has a data-set that includes the following variables measured on 50 small children. Given these variables:
An office equipment company advertises that it will deliver equipment within 15 days of purchase. A sample of 49 past deliveries is taken to test
A normal tomato will gain an average of 2 ounces per week during the growing season. A sample of 100 tomatoes is given a special hormone
It is thought that the front cover and the nature of the first question on mail surveys influence the response rate.
A hearing aid battery manufacturer claims that the battery's mean lifetime is at least 20 days. We will take sample of 16 batteries to test
Descriptive statistics: Interpret this data a provide a description of the data represents. As you compare the means visually, what is your first impression
Does the room size play an important factor in choosing the correct BTU's? A general rule is that 5,000 to 6,000 Btu/hrs. models cool rooms 100 to 300 square
Conduct a hypothesis test to determine if there is a linear relationship (positive correlation) between the two scores or not
Disney tells you that the average distance between the ears on a Mickey Mouse hat is 5 inches. In a sample of 100 Mickey Mouse hats you find that
Before I moved to California, I sold my home in Nevada. My realtor told me that the average price of a 2500 square foot home in Nevada was $250,000.
A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12
Use the following results obtained from a simple linear regression analysis with 12 observations.
In hypothesis testing, the level of significance is?
Given the following hypotheses: the true mean equals 100 (the null) and the true mean does not equal 100 (the alternate), a random sample of six resulted
A TV add, aimed at men, claims that drinking a special weight loss medicine before every meal will result in the loss of at least 5 pounds after two weeks.
A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new machinery has been frequently failing
The following data resulted from an experiment to study the effects of leaf removal on the ability of fruit of a certain type to mature: