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Create a research question on interest for which the appropriate test of the statistical hypothesis would require the use of a z-score. (If you are not sure of the population mean for the variable o
A class in marketing designs two videos advertising an expensive Mercedes sports car. They test the videos by asking fellow students to view both (in random order) and say which makes them more like
One week later, the patients are contacted and 15 patients state the new remedy was helpful in reducing the severity and length of the illness. Which of the following is not correct?
The average yearly snowfall in Chillyville is Normally distributed with a mean of 55 inches. If the snowfall in Chillyville exceeds 60 inches in 15% of the years, what is the standard deviation?
According to Bureau of Transportation Statistics, the percent of on time departures from Orlando International Airport during the period from January 1 to September 30, 2010 was 80.5. Assume that th
Calculate Mean, Variance, and Standard Deviation. Assuming that the distribution on entertainment expenses is approximately normally distributed, calculate estimate of tolerances interval containing
The probability that a contractor will get an electrical job is 0.8, he will get a plumbing job is 0.6 and he will get both 0.48. What is the probability that he get at least one? Is the probabiliti
A report indicated that 47% of adults had received a bogus email intending to steal personal information. Suppose a random sample of 700 adults is obtained.
Construct the 95% confidence interval for the difference between the means µ non - µ donor
Salt-free diets are often prescribed to people with high blood pressure. The following data values were obtained from an experiment designed to estimate the reduction in diastolic blood pressure as
The proportion of the observation from a Standard Normal Distribution that take values ggreater than 1.15 is about
A copy machine dealer has data on the number x of copy machines at each of 89 customer locations and the number y of service calls in a month at each location. Summary calculations give x(bar)=8.4,
Suppose we select and SRS of size n=100 from a large population having proportion p of successes. Let X be the number of successes in the sample. For which value of p would it be safe to assume the
A set of 10 cards consist of 5 red cards and 5 black cards. The cards are shuffled thoroughly and you turn cards over, one at a time, beginning with the top card. Let X be the number of cards you tu
Suppose X has a geometric distribution with probability 0.3 of success and 0.7 of failure on each observation. The probability that X = 4 is
In a particular game, a fair die is tossed. If the number of spots showing is either 4 or 5, you win $1, if the number of spots showing is 6, you win $4, and if the number of spots showing is 1, 2,
A die is loaded so that the number 6 comes up three times as often as any other number. What is the probability of rolling a 1 or a 6?
An assignment of probabilities must obey which of the following?
The study used a matched pairs design instead of a completely randomized design. This is an observation study, not an experiment.
A study of cell phones and the risk of brain cancer looked at a group of 469 people who have brain cancer. The investigators matched each cancer patient with a person of the same sex, age, and race
A researcher wishes to compare the effects of two fertilizers on the yield of a soybean crop. She has 20 plots of land available and she decides to use a paired experiment - using 10 pairs of plots.
An experiment to measure the effect of giving growth hormones to girls affected by Turner's Syndrome was carried out recently in Vancouver.
We wish to investigate if a new medicine is effective in reducing the length and severity of the flu. We take the next 20 patients who come to the walk-in clinic complaining of a flu and , after a m
A nutritionist wants to study the effect of storage time (6,12, and 18 months) on the amount of vitamin C present in freeze dried fruit when stored for these lengths of time.
There is a linear relationship between the number of chirps made by the striped ground cricket and the air temperature. A least-squares fit on some data collected by a biologist gives the model