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How do you decide your null and alternative hypotheses?
In a field study of mating behaviour in the Mormon cricket, a biologist noted that some females mated successfully while others were rejected
The duration of human gestation is on average 40.5 weeks. In a maternity ward, we note the gestational age of 100 consecutive newborns.
Suppose that the sales manager of a large automotive parts distributor wants to estimate as early as April the total annual sales of a region
(a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find the test statistic. (d) Make a decision. (e) Estimate the p-value and interpret it
For the preceding problem you should find that there are significant differences among 3 treatments.
To evaluate the effect of a treatment , a sample of n=9 is obtained from a population with a mean of m=40 and the treatment is administered to the individuals
The association of Home Builders provided information on the cost of the most popular home remodeling projects.
Here are heart rates for a sample of 30 students before and after a class break. At a = .05, was there a significant difference in the mean heart rate?
A half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process
The t distribution is a continuous distribution
The number of degrees of freedom corresponding to between treatments is?
Steps of Hypothesis testing, test that there is no difference between each set.
The EPA fuel economy rating says that the Toyota Prius hybrid car gets 48 mpg on the highway. Deborah wonders whether the actual long-term average
Managers at an automobile manufacturing plant would like to examine the mean completion time, mu, of an assembly line operation
The following data were obtained in a study using three separate samples to compare three different treatments.
You will be asked to determine the correct decision (Reject Ho or Fail to Reject Ho) for each of the following tests of hypotheses.
You are the quality manager for a bottling plant. If the filling process is working as intended, cans stamped with 12 oz. will be filled with just over 12 oz.
Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips
The distribution (shape) of the population (e.g., normal, skewed, flat, etc.)
Did you ever purchase a bag of M&M Peanut candies and wonder about the distribution of the colors? A recent article reported that 30 percent of the candies
You are conducting an evaluation of services at a social service agency
Soft drinks are sold in three sizes at a fast-food restaurant- small, medium, and large. Explain why the size of the soft drinks is an example of an oridnal
According to a recent survey, Americans get a mean of 7 hours of sleep per night. A random sample of 50 students at West Virginia University
A small pilot study is conducted to investigate the effect of a nutritional supplement on total body weight