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Sokal and rohlf 1981 studied purebred Canadian dairy cattle. The butterfat percentages from 2-year-old cows follow a normal distribution with a mean of 4.51 and a standard deviation of 0.348.
a. Find the probability that a 2 year old cow will have a butter fat percentage between 4.25 and 4.60
b. Find the probability that a 2 year old cow will have a butterfat percentage less than 4.75
At the .05 level of significance, is there evidence that that the proportion of delayed Southwest Airlines departures from Phoenix in January 2008 is greater than 25%? State the decision in terms of the problem.
A t-distribution to create 90% confidence interval for population mean. If convenient, use technology to create the confidence interval.
question a parent can choose from 5 types of protein 6 vegetables and 4 desserts. if the parent serves a meal of 1
State the null and alternative hypotheses to determine if the average number of hours until spoilage begins differs for the preservatives A and B?
In a sample of 14 of the bowling balls the sample standard deviation was found to be 0.52 pounds. Construct a 95% confidence interval for the variance of the bowling ball weight.
At the time she was hired as a server at the Grumney Family restaurant, Beth Brigden was told, "You can average more than $20 a day in tips.
the mean and standard deviation of the lifetime of a battery in a portable computer are 3.5 and 1.0 hours
If the standard deviation of the amount spent on books is $8.42, find these probabilities for a randomly selected American. Put answer in percent form.
Let the random variable X represent the number of defective DVD players among 200 randomly selected DVDs of this type. Does the random variable X have a binomial distribution or a Poisson distribution?
How does the efficiency of a regression predict the power of the t-test? How do robust standard errors change the comparison between hypothesis testing using OLS and robust regression? What does dependence in the e do to the t-test? what does non-no..
Test, at the 5% level of significance, whether the population standard deviation of hours spent studying is less than 10. Use the Critical value approach.
a clinical trial is conducted to investigate the effectiveness of an experimental drug in reducing preterm delivery to
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