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Dr. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed the normal distribution with a standard deviation of 2.44 words per essay.
For her 10 A.M. section of 40 students, the mean number of misspelled words was 6.05. Construct a 95 percent confidence interval for the mean number of misspelled words in the population of student essays.
Is this stratified random sampling, systematic random sampling or cluster sampling? Please give reasons for the differences.
The college made a list of all the classes registered in these semester and the randomly selected 25 classes. All students in the selected 25 classes were surveyed.
Assuming that the standard deviation and the normal shape are unchanged, to what level must the mean reduce so that 20 gallons per week is the third quartile rather than the mean?
In a test of a gender-selection method, 14 babies are born and 10 of them are girls. Find the number of different possible sequences of genders that are possible when 14 babies are born
At.05 level of significance determine if correlation between rental cost and apartment size is significant.
What is the value of c for which there is 80% probability that a metal plate has a thickness with in the interval [4.3-c, 4.3+c]?
A group of sheep, infested with tapeworms, are randomly divided into two groups as follows. Each sheep is assigned a number (1 through 20) and then 10 numbers
Absenteeism is distributed evenly throughout the week. The 0.01 level is to be used. The sample results are:
In comparing the two variances below, what is the test value and what are the degrees of freedom that should be used?
In our discussions of basic probability theory the concepts of mutually exclusive events and independent events share prominent roles. Please explain these concepts and in particular address the question
You wish to do a community needs assessment survey of a community to find out how much office space is needed by professionals in the community.
Chlorine concentration in a municipal water supply is a uniformly distributed random variable that ranges between 0.74 ppm and 0.98 ppm.
Construct a scatter plot of P-RFM and P-HELM. If drawing the plot by hand, use graph paper to ensure accuracy.
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
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