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In the past, of all the students enrolled in "Basic Business Statistics" 10% earned A's 20% earned B's, 30% earned C's, 20% earned D's and the rest either failed or withdrew from the course. Dr Johnson is a new professor teaching "Basic Business Statistics" for the first time this semester. At the conclusion of the semester, in Dr. Johnson's class of 60 students, there were 10 A's, 20 B's, 20 C's, 5 D's and 5 W's or F's. Assume that Dr. Johnson's class constitutes a random sample. Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution.
Use α =.05 and .01 and perform a goodness of fit test.
What does r 2 of .73 tell us? Is this a strong or weak correlation? How can you tell?
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
Plot a scatter diagram of the results with Depth of Water as the independent variable.
Use this information to construct a probability table, and then calculate each of the following probabilities:
If we assume all the possible random samples of 250 students at this university, 95 percent of the samples should have means among what two numbers.
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
what sample size should be used in the funding decision study? Use σ = $4000 as a planning value. ________________
Recent studies have shown that the super-cooling temperature of terrestrial frogs frozen at -6°C has a relative frequency distribution with a mean of - 2°C and a standard deviation of 0.3°C (The first of these studies was reported in Science, May ..
Construct a 98% prediction interval for the selling price of a 4l- year old house having 4500 square feet, 13 rooms, and an attached garage.
What is the appropriate set of hypotheses to test such that a possible outcome of the test would indicate;
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