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In a study of the effectiveness of a fabric device that acts like a support stocking for a weak or damaged heart, 110 people who consented to treatment were assigned at random to either a standard treatment consisting of drugs or the experimental treatment that consisted of drugs plus surgery to install the stocking. After two years, 30% of the 60 patients receiving the stocking had improved and 20% of the patients receiving the standard treatment had improved. (Use a statistical computer package to calculate the P-value. Round your test statistic to two decimal places and your P-value to four decimal places.)
z =
P =
The sample mean life is 5.5 years with a standard deviation of 0.6 years. If you were constructing a 99% two-sided confidence interval estimate, the lower limit would be?
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
The population of car speeds is approximately normally distributed. Determine a 90% confidence interval estimate for the speed of all cars.
If the standard deviation is 4.09, how large a sample is needed to get the desired information to be accurate within 0.53 decibels? Show all work.
If Household is selected at random, find out the probability that it feels economic conditions are good?
For the preceding problem you should find that there are significant differences among the three treatments. One reason for the significance is that the sample variances are small.
Marketing firm asked the random set of married and single men as to how much they were eager to spend for vacation. At alpha= .05, is a difference in two amounts?
Compare population means or proportions to determine the relationship between variables.
Develop the "best" regression model possible using this set of variables to help you predict the Risk. State your final model. Interpret the coefficients for the model (i.e. what do the numbers mean?).
A supermarket advertises that the waiting time spend by customers waiting in line at the cash register is uniform between 0 and 6 minutes.
a clinical trial tests a methods designed to increase the probability of conceiving a girl. in the study 540 babies
The bus averaged 40 mph on the drive from Columbus to Athens but averaged 60 mph during the return trip. What was the average speed of the bus for the entire trip?
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