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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.
Give an example of a repeated measures analysis of variance (ANOVA)--no examples of therapy or temperature.
Supposing that both populations are normally distributed, construct a 99% confidence interval for the ratio of the two population variances.
Also use the regression model to predict a student's average if he/she misses 4 classes.
Computing the mean and standard deviation for the given data - Find the value for the new standard deviation
Repetitions of numbers are not permitted, i.e., the same number cannot be used more than once in a total sequence. As examples, 27, 94 or 55 would not be permitted. How many different code groups can be designed?
The State of Ohio plays a daily (except Sunday) three digit lottery, where the player chooses any three numbers, 1 thru 10, three different times.
A mortgage department of a large bank is studying its recent loans. Of particualr interest is how such factors as the value of the home (in thousands of dollars), education level of the head of the household, age of the head of the household, curr..
Find the least squares regression line by deciding which are the appropriate independent and dependent variables and calculating the equation of the line. State equation of line.
What does central limit theorem say about distribution of John's average payoff after 365 bets in a year?
Developing project network using AOA that determines completion times.
A 95% confidence interval for the proportion of all adults who bought a lottery ticket in the past year is (assume Gallup used an SRS)
The field of statistics can be roughly subdivided into two areas: descriptive statistics and probability.
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