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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.)
The article claims that the distributions of annual returns for both common stocks and long-term government bonds are bell-shaped and approximately symmetric. Assume that these distributions are distributed as normal random variables with the mea..
Classifcation Which of the following are continuous variables and which are discrete?
Assume the FDA has established 200 grams of fruits and vegetables as minimum daily intake. Determine the probability woman selected will meet this minimum intake?
What is the probability that the sample proportion,p^ , will be within ± 3 percentage points of the true p, i.e., Pr{0.42 ≤p^ ≤ 0.48}?
a nutrition store in the mall is selling memory booster which is a concoction of herbs and minerals that is intended to
Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30.
What is the probability that a typical family will purchase and at least 3 tubes of toothpaste in any given month?
examine the regression 90 confidence interval 90 prediction interval using 1990 and 2004 energy use kg oil equivalent
in a certain community 20 of the families own a dog and 20 of the families that own a dog also own a cat. it is also
an american roulette wheel has 38 slots 18 are red 18 are black and 2 are green. let r be the number of spins until you
Construct the 90 percent confidence interval for the proportion of checking account customers who have a Visa card with the bank. (Round your answers to 3 decimal places.)
Can we reject the hypotesis that the birthays are equally during each season of the year? use the 0.10 level of significance
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