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On a multiple choice test with 40 questions, each question has four possible answers, and each question has one correct answer. 3a) For students who guess at all answers, find the mean and standard
A prize is hidden at random behind one of three doors. If you pick the correct door, you get the prize that is behind it. You have picked Door 1. Let A be the event "Prize is behind Door 1" Let B be
Suppose that in a large city, 60% of the voters favor the construction of a new ball park. In a survey where voters are asked whether they favor the construction of the new balll park, find the prob
A two-sample t test is performed with Ha:u1>u2 and a test statistic of t=-1.24 is observed. Draw a sketch of the area corresponding to the p-value, and find the range of the p-value when df=12.
If a score of below 60 represents a grade of F, what percent of students failed the test? how many points must be added to the students' score so that only 5% fail?
The weight of each client at a weight -loss clinic is measured. The variable is A) cannot determine B) qualitative
In the linear regression model, it was found that the 90% confidence interval for the regression coefficient B is (1.5,9.3). What can you say, if anything, about the p-value of test of hypotheses H
Find the P-value obtained when testing the claim that p = 0.75 when given sample data resulting in a test statistic of z = 1.20.
A research firm tests the miles-per-gallon characteristics of three brands of gasoline. Because of different gasoline performance characteristics in different brands of automobiles,
Random sampling from four treatments produced the following data: Compute the SSTR.
Suppose you toss a fair coin 12 times. What is the probability of getting exactly 10 Heads.
Suppose scores on an IQ test are normally distributed. If the test has a mean of 100 and a standard deviation of 10, what is the probability that a person who takes the test will score between 90 an
Nine hundred (900) high school freshmen were randomly selected for a national survey. Among survey participants, the mean grade-point average (GPA) was 2.7, and the standard deviation was 0.4. What
If a decision model has one variable with a certain/deterministic input value and another variable with a random/probabilistic input, then the outcome of this model which is based on both variables
A new phone answering system for a company is capable of handling nine calls every 10 minutes. Prior to installation the new system, company analysts determined that theincoming calls to the system
A golf course architect has five linden trees, three white birch trees, and three bald cypress trees to plant in a row along a fairway. In how many ways can the landscape plant the trees in a row,
A paired-samples test is reported as t(18) = 1.73. Make a decision about this test, assuming a two-tailed hypothesis test with a p level of 0.05.
Number of standard deviations a sample is from the population mean. Number of standard deviations an individual score is from the sample mean.
A researcher studies 45 volunteer citizens from a small community and asks them about the amount of caffeine (in milligrams) they ingest before and after lunch each day, a phenomenon that imagine we
In a paired-samples t test, the null hypothesis posits that the mean of the comparison distribution is:
With very few degrees of freedom, the test statistic:
For the single-sample t test, the confidence interval is centered around the:
When conducting a paired-samples t test, we compare our sample mean difference to:
When conducting a paired-samples t test, we can assess the practical importance of our obtained results by calculating:
If the standard deviation for a population, as estimated from a sample, is s = 5.6, then the standard error for a sample size of N = 16 is: