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1. How many different two-person committees can be formed from a group of six people?
2. If automobile license plates consist of two letters followed by four digits, how many different possible license plates are possible if letters and numbers can be repeated?
3. Advertising claims, "Four out of five doctors surveyed recommend Try it for their patients with arthritis." Discuss why you would or would not accept this as a valid claim to product superiority.
4. A random sample of 100 students at Southern University was collected. The mean age was found to be 24.2 years, with a standard deviation of 3.4 years.
a. What percentage of students are over 27.6 years old?
b. What percentage of the students is between 20.8 and 24.2 years old?
c. If a student is selected at random from Southern University, what is the probability that he or she will be over 20.8 years old?
Do 1-sample t-test to see if people in Chicago have travelled to fewer states than people nationwide. Utilize the 10% (.10) level of significance.
CASE STUDY: Are the Fish Safe to Eat? Assessing which Factors affect Mercury Levels in Fish in Maine Lakes.
A normal distribution with a mean of 55 and a standard deviation of 6 is evaluated to solve a business problem.
Answer the following three questions based on what you know about statistics now.
how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
The standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
Evaluate the standard deviation - use the conservative value for the degrees of freedom, Assume the two groups are independent and the data are approximately Normal. Let µ 1 and µ 2 represent the mean heart rates we would observe for the entire po..
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
She is interested in testing the null hypothesis that the mean SAT score is the same for each type of schooling using the one-way ANOVA. Some summary statistics for the three groups are given below, followed by the one-way ANOVA table.
Using the probabilities above what is the expected size of family you draw?
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