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It is suspected that a random variable has a normal distribution with a mean of 6 and a standard deviation of 0.5. After observing several hundred values, we find that the mean is approximately equal to 6 and the standard deviation is close to 0.5. However, we find that 53% percent of the observations are be- tween 5.5 and 6.5 and 83% are between 5.0 and 6.0. Does this evidence increase or decrease your confidence that the data are normally distributed? Explain your answer.
locate a news article or report in a popular news source such as time newsweek or the wall street journal in which a
in a study of facial behavior people in a control group are times for eye contact in a 5-minute period. their times are
If a correlation coefficient was calculated for n = 15, alpha = 0.01, and r = 0.85, what is the test value found using the t-test?
a restaurant offers a special pizza with 5 toppings. if there are 12 toppings from which to choose how many different
the distribution of vitamin c amount in vitamin drops produced by a given factory is approximately normal with a mean
Minimum number of workstations that can be formed Identification of tasks in each work station using a combination of algorithmic and heuristic approaches The efficiency of the line
A clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug considered standard care and to placebo.
a consulting firm has to make a decision concerning bidding on a major project that has a projected profit for the firm
according to a recent survey of new jersey households the probability that the residents own 2 cars if annual household
Suppose that an executive of a venture capital investment firm is trying to decide how to allocate his funds among three different projects, each of which requires a $100,000 investment.
Using the six-step critical value approach, at the 0.05 level of significance, is there evidence that the population mean delivery time has been reduced below the previous population mean value of 25 minutes?
At the 0.01 level, is the bank loan financially sound (should the bank ask for additional collateral)? What is the decision rule?
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