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A random sample of 21 ?people, the mean commute time to work was 32.6 minutes and the standard deviation was 7.2 minutes.
Assume the population is normally distributed and use a? t-distribution to construct a 90?% confidence interval for the population mean μ.
What is the margin of error of μ??
The confidence interval for the population mean μ is
The sheet EZDescription describes the variables for this question. The data are on unemployment claims in Anderson (IN) from 1980 through November 1988. In 1984, an enterprise zone ("EZ") was located in Anderson (as well as other cities in Indiana..
Although we have not emphasized it, the paired t-test can be used to test hypotheses in which the null value is something other than 0.
Define the null hypothesis. If the null hypothesis is rejected then? Read the Z statistic from the normal distribution table:
Assume that previous fast-food research has shown that 80 percent of the consumers like curly french fries. The researcher wishes to have a standard error.
web crawlers need to estimate the frequency of changes to web sites to maintain a current index for web searches.
Before the recession, job-creating cities in the Sunbelt, like Las Vegas, Phoenix, and Orlando saw their populations, income levels, and housing prices surge.
A local politician in this town has stated that the average property taxes are $1800 and most people do not pay more than this amount. Conduct a test at the alpha = .01 level to determine if this is true. For this test, consider a sample size of 3..
Suppose that in 20% of all traffic accidents involving an injury, driver distraction in some form (for example, changing a radio station or texting).
a clinical trial was conducted to test the effectiveness of the drug zipiclone for treating insomnia in older subjects.
R2 000 is invested at 10% per annum compounded half-yearly. After three months, the interest rate changes to 12% per annum compounded monthly. Find the value of the investment after two years.
according to the ioc female participation in the 2000 summer olympic games was 42. a sports-merchandising expert
(a) Suppose that we round off the time by taking the integer part. Calculate the probability that the first event from to will be a birth.
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