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A survey of 400 women for the American Orthopedic Foot and Ancle Society revealed that 38% wear flats to work.
a. Use this sample information to develop a 99% confidence interval for the population proportion of women who wear flats to work.
b. Suppose the society wished to estimate the proportion of women who wear athletic shoes to work and the proportion of women who wear flats to work within a margin of error of 0.01 (one percentage point) with 95% confidence. Determine the sample size required.
A new speed limit will be initiated such that approximately 10% of vehicles will be over the speed limit. What is the new speed limit based on this criterion? In what way do you think the actual distribution of speeds differs from a normal distribu..
In the following questions, you should demonstrate your understanding of sampling distribution:
Find out the mean number of letters that will arrive in two days.
Sketch the distribution of sample means for sample of n = 25 scores from this population.
Determine the likelihood of accepting a lot which is 1% defective?
Develop a multiple regression model with categorical variables that incorporate seasonality for forecasting sales using the last three years of data in the Excel file New Car Sales.
Is the hot-air balloon significantly shorter than light rail? How can you tell? What do you tell university officials?
Set up probability distribution by illustrating all x values and their associated probabilities. List sample space of tossing a fair coin.
Using a normal distribution with a mean of 1118 and a standard deviation of 52 for the weights of steers, what percent of steers weigh over 1250 pounds, under 1100 pounds, between 1000 and 1150 pounds.
A simple random sample of 50 adults is obtained, and each person's red blood cell count (in cells per micro-liter) is measured. The sample mean is 5.23. The population standard deviation for red blood cell counts is 0.54.
Calculate the correlation and the regression equation and plot the data in the space provided.
If an applicant is randomly selected, find the probability of a rating that is between 200 and 275.
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