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A survey of 21 grocery stores revealed that the average price of a gallon of milk was $2.56 with a standard error of $0.20. What is the 95% confidence interval to estimate the true cost of a gallon of milk.
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
Suppose it is known that a new treatment is successful in curing muscular pain in 75% of the cases. If it is tried on 9 patients, find the probability that fewer than 7 patients are cured.
a professor gives an exam for which there are two versions a and b. each student in the class is given one randomly
Draw a bar graph to represent the data.- Draw a pie chart to represent the data.- Explain which picture-bar graph or pie chart-you think is more informative.
Draw ogives from the following data and measure the median value and compute the value of arithmetic mean
Let X be random variable which counts number of cars that, in given unit of time, pass by Joe's Barber Shop on Main Street. Determine the distribution of X?
The Dean is hanging his head in shame. He realizes his failings in designing an adequate research design to assess the effects of the move on majors and has revised the proposal.
Find a 99.9% confidence interval for the mean weight of all bumblebee bats at the following confidence levels (two places after decimal):(______, ______)
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
question in a study investigating freshman weight gain the researchers also looked at gender differences in weight
Use the given data to find the best predicted value of the response variable.Eight pairs of data yield r = 0.708 and the regression equation y = 55.8 + 2.79x. Also, mean y = 71.125. What is the best predicted value of y for x = 5.7?
a box of tickets has an average of 100 and sd of 20. four hundred draws will be made at random with replacement from
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