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An article in a medical journal found that percutaneous nephrolithotomy (PN) had a success rate in removing kidney stones of 289 out of 350 patients. The traditional method was 78% effective. Is there evidence that the success rate for PN is greater than the historical success rate? (Use the 4-step procedure to conduct a hypothesis test)
an insurance company found that 2.5of male drivers between theages of 18 and25 are involved in serious accidents
543 people were selected at random from a large population. 505 of them said they had the internet installed on their
Thirty-five percent of the democrats and 70% of the republicans favor the bill. the bill needs a simple majority to pass. using a probability tree, determine the probability that the bill will pass.
Using the stem and leaf technique, construct a less-than cumulative frequency distribution. -Draw to scale a histogram, frequency polygon and less-than cumulative ogive using the information from 1.
the number of goals scored in a hockey match between the home team x and the visiting team y respectively follows each
For some positive value of Z, the probability that a standard normal variable is between 0 and Z is 0.3770. Find value of Z? For some value of Z, the probability that a standard normal variable is below Z is 0.2090. Find value of Z?
A researcher investigating sex role stereotypes and occupational aspirations drew a random sample of 125 female university students.
Based on comparing the computed statistic to the critical value which of the following is true and BMI for Boston residents is significantly different than 25.
The Bureau of Labor Statistics in its Monthly Labor Review published the over per month percent change in the price index for imports from April 2006 to April 2007. Calculate the average percent change for the 9 months of 2006 and the 4 months of 2..
Find the probability that student A made no mistakes when entering a randomly selected form. Find the probability that student B made no mistakes when entering a randomly selected form.
the following data are from an independent-measures experiment comparing two treatment conditions.treatment 1
Withdrawals of $400 for 3 years. Find the balance of her account just after the last withdrawal (on february 1,2001)if the monthly interest rate is 6%.
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