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Question: A student polls his school to see if students in the school district are for or against the new legislation regarding school uniforms. She surveys 600 students and finds that 480 are against the new legislation.
a. Compute a 90% confidence interval for the true percent of students who are against the new legislation, and interpret the confidence interval.
b. In a sample of 300 students, 68% said they own an iPod and a smart phone. Compute a 97% confidence interval for the true percent of students who own an iPod and a smartphone.
What are the mean and standard deviation of the sample proportion who are at least 75 years of age in samples of 250 respondents?
Find a 95% confidence interval for the mean total cost of all customer orders. Then do this separately for each of the four regions.
question visit the australian bureau of statistics website and get the catalogue 6302.0 average weekly earnings
A sample size of 900 is not large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is 0.995 and the standard deviation of all possible sample proportions increases as th..
A clinical trial was conducted comparing a new compound designed to improve wound healing in trauma patients to a placebo. After treatment for 5 days, 58% of the patients taking the new compound had a substantial reduction in the size of their wou..
Do students who attend more than 80% of the statistics lectures in a particular statistics class receive higher grades than those who do not?
A botanical researcher wishes to design a survey to estimate the number of birch trees in a study area. The study area has been divided into 1000 units or plots.
Construct a 90% confidence interval for the population proportion of students who believe the mascot should be changed.
Write in interval notation the real numbers greater than or equal to 3 and less than 9. Translate the verbal expression into an algebraic expression: a cubed minuis b cubed.
Quarters with weights between 5.550 g and 5.790 g. If 280 different quarters are inserted into the vending machine, what is the expected number of rejected quarters?
A weightlifter's maximum bench press (in pounds) in each of six successive weeks was 280, 295, 275, 305, 300, 290. Find the standard deviation.
a study examining the correlation between caffeine and consumption and the speed of running during an athletic event
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