Confidence interval for the difference
In a random sample of 500 people aged 20-24% , 22% were smokers. In a random sample of 450 people aged 25-29, 14% were smokers. Construct a 95% confidence interval for the difference between the population proportion P1-P2
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Height of ballis provided by quadratic equation h=- 4.9t^2+42t+70 where h is in meters and t is time in seconds since ball was thrown. Determine time it takes ball to hit ground.
Claim U=111 sample data: n=10, xbar=101, s=15.3. The sample data appear to come from the normally distributed population with unknown mean as well as standard deviation.
Describe the null and alternative hypotheses to be tested. Calculate the expected frequencies. Calculate the test statistic.
A medical journal reported the following frequencies of deaths due to cardiac arrest for each day of the week:
Determine average rate of change from 2004 to 2006. Interpret meaning of this measure (include units). Average rate of change from 2006 to 2008 is -959.
The null hypothesis is to be tested at 95% confidence. Find out the critical value for this test. What do you conclude? Find out the p-value and perform the test.
Determine the null and the alternative hypotheses. Describe the contingency table of the expected frequencies. Calculate the test statistic.
Scores on aptitude test are distributed with mean of 220 and standard deviation of 30. The shape of distribution is unspecified. Determine the probability that the sampling error made in determining the population mean by mean of random sample of
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