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Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 70 students in the highest quartile of the distribution, the mean score was x = 175.50. Assume a population standard deviation of ? = 7.69. These students were all classified as high on their need for closure. Assume that the 70 students represent a random sample of all students who are classified as high on their need for closure. Find a 95% confidence interval for the population mean score ? on the "need for closure scale" for all students with a high need for closure. (Round your answers to two decimal places.)
Give the regression model for predicting a person's height from his or her weight. Interms of these variables, explain what the slope of this model represents here
heights of men on a baseball team bell-shaped distribution wit ha mean of 183 cm and a standard deviation of 6 cm.
a magazine published a study on the ammonia levels near the exit ramp of a highway tunnel. daily ammonia concentrations
a quarter that is tossed 60 timeswhat is the probability that it will come up heads 20 or more times? estimate the
part i.question 1.a 90 confidence interval estimate shows that there is a 90 percent chance that the true population
stating the hypotheses. in each of the following situations a significance test for a population mean acircmicro is
An entrepreneur is considering the purchase of a coin-operated laundry. The present owner claims that over the past 5 years, the average daily revenue was $675 with a standard deviation of $75.
If an individual from this age group is selected, find the probability that his or her blood pressure will be between 70 and 95. Assume normal distribution.
the mean is always the best measure of central tendency to use.truefalseif you use a simple random sample then your
an april 2004 article stated that americans have an average of 2.11 televisions per household. if the standard
Cars arrive at a toll booth at a mean rate of five cars every 10 minutes according to a Poisson process. Find the probability that the toll collector will have to wait longer than 26.30 minutes before collecting the eighth toll.
If probability of getting sample mean x less than unreported sample mean is 0.025, determine value of the unreported sample mean?
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