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A recent political poll for a local election indicated that 70% of the 250 voters sampled preferred Candidate A. Candidate B is surprised by this survey because he thought that the race was a dead heat, that is 50% preferred A and 50% preferred B. Based on this poll is 50% a possible population proportion of those preferring candidate A? Compute the 95% confidence interval and explain why you think 50% is still likely or why it is not likely.
Draw the histogram for these data using an initial class boundary of and a class width of . Note that you can add or remove classes from the figure. Label each class with its endpoints.
question two sample test of hypothesis- unpaired test of hypothesis t-testgender discrimination? your firm is
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages.
For a group of 10 men subjected to a stress situation, the mean number of heartbeats per minute was 126, and the standard deviation was 4. Find the 95% confidence interval of the true mean.
What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations σ1 and σ2?
A food snack manufacaturer samples 11 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 15.2 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
Distributed with a mean of 30 minutes and a standard deviation of 8 minutes. What is the probability that a randomly selected individual will have a waiting time between 15 and 45 minutes.
If all the other quantities remain the same, how does the indicated change affect the width of the confidence interval?
use this calculation table for the chi-square test for goodness-of-fit to complete this
Mention all samples of size 3, and compute the mean of each sample. Compute the mean of the distribution of sample means and the population mean.
in a survey of 1000 randomly selected adults in the united states participants were asked what their most favorite and
Construct a 95 percent confidence interval for the true mean.
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