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A state's environmental agency worries that many cars may be violating clean air emissions stan dards. The agency hopes to check a sample of vehicles in order to estimate that percentage with a margin of error of 3% and 90% confidence.
To gauge the size of the problem, the agency first picks 60 cars and finds 9 with faulty emissions systems. How many should be sampled for a full investigation?
in a batch of 8000 clock radios 8 are defective. a sample of 12 clock radios is randomly selected without replacement
Construct one bar graph illustrating the relationship between sales and income for each separate year of Amazon's existence.
Find a condition on the ci such that the estimate is unbiased. show that the choice of the ci that minimizes the variances of the estimate subject to this ondition is ci = 1/n where i=1,...,n.
a researcher estimates the 95 ci for a sample with a mean of m 3.26 and a standard error ?m of 0.91. what is the upper
a study was conducted to determine if there is a difference between the investing preferences of mid-level managers
SPSS for Beginners 6a: One-sample t-tests and Confidence Intervals
Construct a graph of the time series. Does the overall trend appear to be upward or downward? Determine the three-month and five-month centered moving average curves and superimpose each on the original time series.
Consider the experiment of throwing an ideal die three times(all outcomes are equally likely). Let X and M denote the mean and the median respectively, of the three scores obtained.
The length of a human pregnancy has a mean of 267 days and a standard deviatin of 16 days. Assume a normal distribution. What percent of pregnancies last over 283 days.
What does r 2 of .73 tell us? Is this a strong or weak correlation? How can you tell?
A random sample of 5 parks is selected and the number of acres is shown at alpha= 0.05, find the critical value. 944, 1036, 790, 5842,566
Fit the model to the data.- Check model adequacy by interpreting the F and R2 statistics.- Construct a plot of the residuals versus x, gestation period.
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