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At a college, two professors, Saber and Tooth, are each teaching large sections of introductory statistics with 500 students in each section
Sandy's Pizza has generally assumed that the mean age of its customers was 30 years of age or younger. A random sample of 50 customers revealed the following:
In hypothesis testing, the null hypothesis is tested and a decision is made as to whether to reject or not reject the null hypothesis.
A recent news report indicates that the mean (Ã?µ) number of years that first-time drug offenders are sentenced is 10.65.
A researcher would like to determine whether humidity can have an effect on eating behavior. It is known that under regular circumstances
Using the sample data, perform the hypothesis test for each of the above situations in order to see if there is evidence to support your manager's belief
Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box
The group is for 65 teachers doing a pretest post and at 12 months knowledge quiz on diversity in the class room
The following data compares the statistics scores from 2 groups of students who were randomly sampled at the beginning of the study, and then randomly assigned
Statistical aptitude scores are known to be normally distributed, with mean = 50. A researcher has designed a new program intended to improve students
Based on a classical approach, the probability of an event is defined as the number of favorable outcomes divided by the total number of possible outcomes.
Assume that you are working on a team that has been commissioned by a large school district to collect and analyze data related to a recent curriculum
A researcher assessed the role of routine walking in physical fitness. In this experiment n=60 pair of subjects were matched for age, gender and weight
It was a good start addressing the introduction to hypothesis testing process. However, it is missing an important part
ummarize the results and analyze the data. The data is Alice's results of whether she knows the difference between Coca Cola from Pepsi.
Describe what is measured by the estimated standard error in the bottom of the independent measures t test.
Give me 2 or more examples of a comparison between the old times and the present day? For example: Why do people care about their weight
Researchers routinely choose a-level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower a-level
Explain why t distributions tend to be flatter and more spread out than the normal distribution.
McKeown et al. [1952] investigate evidence that the environment is involved in infantile pyloric stenosis. The relationship between the age at onset
Which of the following statements is true about the alternate hypothesis?
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented
It is pretty common across most schools to find the grades at the MBA level divided between A's and B's.
Stonehenge's main ditch was dug in a series of segments. Excavations at the base of the ditch uncovered a number of antlers which bore signs of heavy use
How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis