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A researcher is interested in whether the color of an animal's surroundings affacts learning rate. She tests 16 rats in a box with colorful wallpaper. Assume it is known that the average rat can learn to run this particular maze (in a box without any special coloring) in 25 trials, with a variance of 64; the distribution is normal. The mean numbers of trials to learn maze for the group with the colrful wallpaper is 11. What is the standard deviation of the distribution of means?
Assuming that this probability does not change, he would like to compute the probability that he will score on 1 or more of his next 4 attempts. He should use?
Perform the sensitivity analysis for the COM-TECH case. Assume you are interested in following two probabilities: probability of receiving grant, and probability of high cellular R&D costs.
The Kirschner Company has a contract to produce garden hoses for a customer. Kirschner has 5 different machines that can produce this kind of hose. Write the constraint that indicates they have to use at least three of the five machines in their p..
The parameter of interest is the mean score in this population. The sample is an SRS of size n = 4 drawn from the population. a) Find the mean of the 10 scores in the population. This is the population mean.
Explain the difference between the null and alternative hypothesis. Which one can be proven in a statistical sense?
A clothing retailer wishes to investigate the relationship between order size (in dollars) and the level of satisfaction of the customer.
Two bonus points for rigorously proving Xt and Xt+1 are not independent. Let Xt=1+et-0.5et-1, t=1,2,3,..., where et~IID N(0,2), variance of et is 2. Calculate the mean of Xt.
Drugstore was the first e-commerce company to offer Internet drugstore retailing. Drugstore.com customers were provided the opportunity to buy health, beauty, personal care, wellness, and pharmaceutical replenishment products over the Internet.
Many newspapers, when reporting results of political polls, say that 'with 95% confidence, the results are in error by no more than ±3 percentage points'.
Construct a 95 percent confidence interval for the mean number of misspelled words in the population of student essays.
A doctoral student is designing a research study. She is hoping that the results of the study are statistically significant. What type of p-value would she want to obtain? Select one of the following.
In business, investors are always interested in the tradeoff between returns and risk. Regression analysis is a statistical technique that can be used to quantify this risk.
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