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Police on a heavily traveled highway claim that the average car exceeds the speed limit of 65 mph by at least 10 mph. A random sample of 50 cars is evaluated and found to have an average speed of 82.5 mph with a standard deviation for this sample of 7.3 mph. Determine the 95% confidence interval for this example, state the null and alternative hypothesis about the police's claim and determine if the claim is indeed correct at a significance level of α=0.05
a random survey of a small group of high school students collected information on the students age and number of bookd
Researchers at The Wharton School of Business have found that men and women shop for different reasons (Knowledge@Wharton, November 28, 2007).
What proportion of kids aged 10-15 years is assumed to follow a normal distribution with a mean of 191 and a standard deviation of 22.4
Sales in hundreds of dollars over a five-day period and determine whether differences between the two groups are statistically significant.
Develop a simple regression model to redict models, (B) gender is a necessary variable, Data were collected for 32 plants. The data were used to fit the model and the SAS printout of the multiple regression analysis is shown below.
Based on the boxplots in part (a), which of the two groups, students or teachers, tends to have watch times that are closer to the true time? explain you choice.
suppose we rolled a pair of fair dice and count the number of dots located and the face that lands up. describe this
find the general solution for the ode yx2y20 and verify the answer by
In one study of 71 smokers who tried to quit smoking with nicotine patch therapy, 32 were not smoking one year after the treatment. Use a 0.10 significance
According to a study conducted by a major computer company, 62% of men and 69% of women say that weight is a very important factor when purchasing a laptop.
Developing the memo: In the body of the memo write the sample logistic regression equation. In the body of the memo interpret the meaning of the intercept and slopes for your fitted model
The freshman 15 refers to the urban legend that is the common belief that students gain an average of 15 lb during freshman year. The weights of 100 freshmen at a certain university were observed in August and then in May. The claim that the mean ..
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