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We sample 20 new cars and find the average miles per gallon to be 26 with a standard deviation of 1.7.
Q: If we increase our sample size to 40, what is the standard error of the mean?
**need equation and calculations**
Independent random samples taken at two local malls provided the following information regarding purchases by patrons of the two malls.
Does secondhand smoke increase the risk of a low birthweight? A baby is considered have low birthweight if he/she weighs less than 5.5 pounds at birth. According to the National Center of Health Statistics, about 7.8% of all babies born in the U.S. a..
The average Monthly rent for one bedroom apartments in Chattanooga has been $700. Because of the downturn in the real estate market, it is believed that there has been a decrease in the average rental. State the null and alternative hypothesis
Compute the following variances: Materials price and usage variances. Labor rate and efficiency variances. Variable overhead spending and efficiency variances. Fixed overhead spending and volume variances.
Develop a regression model and complete appropriate analysis of the three largest U.S. Air carriers
Suppoe that A1, A2, A3 form a partition of the universal set S. Let B be an arbitrary set. Assume that we know |B∩A1|=10, |B∩A2|=20,
Let's say we have a population comprised of four typists with the following numbers of errors per page of a manuscript: Stephanie X1=3
A random variable x has mean -4 and E(X)^2=20. What is the standard deviation of X.
Consider the following news headline, "Cigarette Smokers Make Lower College Grades than Nonsmokers" The news article goes on to say that researchers at a university collected information on rate of cigarette smoking (total number of cigarettes smoked..
In the general population one in 8 women will develop breast cancer. 1 in 550 carries the mutationBRCA gene. 9 out of 10 women with this mutation will develop breast cancer.
Suppose a gun sprays paint in a uniform back-and-forth movement, covering an angular sweep between forty five degrees to either side, onto a screen 100cm away. Assume that the distribution of paint at a distance ±x to either side of the centre of the..
A severe storm has an average peak wave height of 16.4 feet for waves hitting the shore. Suppose that a storm is in progress with a severe storm class rating. Let us say that we want to set up a statistical test to see if the wave action
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