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The weekly salaries of teachers in one state are normally distributed with the mean of $490 and a standard deviation of $45. What is the probability that a randomly selected teacher earns more than
Why would you use the Tukey-Kramer procedure?
What is the probability that of the six missiles fired a) exactly five will hit the target, b) at least three will hit the target, c) all six will hit the target?
What additional information is obtained from measurements on an interval scale compared to measurements on an ordinal scale?
In a multiple regression mode, the value of the coefficient of multiple determination
In a statistical test, the probability of making Type I and Type II error were found to be 0.0234 and 0.6, respectively. What is the power of the test? Please give solution and illustration.
If we are testing for the difference between the means of 2 related populations with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to
Under what circumstances should you use a grouped frequency distribution instead of a regular frequency distribution?
If 10 employed women are selected at random, what is the probability that exactly 2 have never been married? Give answer with 4 decimals.
A random sample of discount prices gives the following prices: 221, 286, 290, 330, 310, 250, 270, 280, 299, 265, 291, 275, and 281. At one percent level of significance, can you conclude that the me
When 325 college students are randomy selected and surveyed, its found that 117 own cars. Construct a 99% confidence interval estimate of the true proportion of all college students who own cars.
Suppose the probability distribution X= number of jobs held during the past year. Find the probability that a randomly selected student held two or few jobs during the past year.
The concept of Type I and Type II Error is critical and will come into play with each and every statistical test you perform. Discuss the implications of making both a Type I and Type II error. &n
The following frequency distribution presents a set of exam scores for a class of N = 20 students. What is the percentile rank for X = 90?
What is the probability that a baby is born between 5:15 and 5:25, given that it was born between 5:00 and 6:00?
Find examples in the research that utilize the independent and dependent t-tests that are used to answer a question. Find the t value and its associated p value.
A researcher has reason to believe that, for an experiment with 50 points, a 95% prediction interval would be of width 8. If the researcher wishes to run a more precise experiment that will result
Suppose we have a population of scores with a mean (µ) of 975 and a standard deviation (s) of 15. What percentage of the population will lie between 960 and 990?
Consider the following time series data.Week 1 2 3 4 5 6Value 18 13 16 11 17 14 Using the naive method (most recent value) as the forecast for the next week, compute the following measures of foreca
The number of students visiting their professor during office hours each day has a Poisson distribution with average of 5 students every two days. For a given day, find the probability that at leas
Explain the difference between qualitative, quantitative, discrete, and continuous variables.
Describe a situation in your business or personal life that required research. You also may describe a current situation that will require research in the future.
Your measurements are {12,9,13,12,14} all in mm. Find the mean, standard deviation, and standard error on the mean. Include units.
How large a sample should be so that we can assert with 95% confidence that the margin of error of the estimation is less than 3%?
What is teh probability that the height of a randomly selected female college basketball player is more than 66.5 inches?