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To test the effectiveness of a treatment, a sample of n = 25 people is selected from a normal population with a mean of µ = 60. After the treatment is administered to the individuals in the sample, the sample mean is found to be M = 55.
a) If the population standard deviation is σ = 10, can you conclude that the treatment has a significant effect? Use a two-tailed with α = .05.
b) If the population standard deviation is σ = 20, can you conclude that the treatment has s significant effect? Use a two-tailed test with α = .05.
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
What is the probability that a cereal would either high calorie or high fiber? In other words, what is P(high calorie or high fiber)?
A work-study engineer times a certain operation, and discovers that the average time it takes is 10 minutes, but on 15% of occasions it takes more than 13 minutes.
Girl B throws 15 times, with a prob. of success = 0.2. And girl C throws 20 times, with a probability of success equal to 0.1. Determine the probability that the target will get hit at least 12 times.
Probability based on addition rule - Find the probability that a randomly chosen sold automobile from this sample is silver or an SUV?
A cognitive psycholgist believes that a particular drug improves short-term memory. The drug is safe, with no side effects. An experiment is conducted in which 8 ramdomly selected subjects are given the drug and then given a short time to memorize..
Calculate the Pearson correlation for these data also determine whether there is a significant correlation among attitudes for husbands also wives.
Estimating the sample standard deviation using normal score - Find the sample standard deviation?
For each problem, compute a Welch F-statistic and determine whether or not significant differences exist among the treatment conditions.
Automobile manufacturers are interested in the difference in reaction times for drivers reacting to traditional incadescent lights and to LED lights.
Using the .01 level, what should the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution, the cutoff (or cutoffs), and the scor..
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
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