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1) You did a two-tailed t test for means equality and in step #2 you got a t value of 2.333. Assuming 22 degrees of freedom, calculate the exact step #5 p-value.
2) A new vaccine for Ebola has entered clinical trials. Preliminary results are good but it seems that 5% of treated patients develop the side effect of rashes on their bodies.
a) If 112 people received this vaccine, what is the probability that 5 or more of these people develop the side effects of rashes? Use the normal approximation to a binomial without the continuity correction.
b) If 112 people received this vaccine, what is the probability that two or less people develop the side effects of rashes? Use the normal approximation to a binomial without the continuity correction.
In part b, the sample have greater variability than part a, but the sample sizes are unchanged. how does the larger variability affect the size of the standard error for the sample mean?
1.a researcher wants to know if calcium is an effective treatment for lowering blood pressure. he assigns one randomly
consider the function fxx3-2x4 on the interval -22 with h0.25. use the forward backward and centered finite difference
determine the point estimate of the population mean and margin of error for the confidence interval. lower bound is 16
A Company produces candy on a production line. When operating properly, the production process will produce an average of u=140 pounds of candy per hour with a standard deviation of o=20 pounds of candy per hour.
in 2006 merck released a vaccine named gardasil for hpv - the most common cause of cervical cancer among young women.
Identify the scale of measurement in each of the following:
sales 2363 2.1 advertising - 279 price - 136 unemplpyment r2 .76what would be the expected unit sales when
A sample of households that subscribe to the United Bell Phone Company revealed the following numbers of calls received by each household last week. Determine the mean, median, and standard deviation of the number of calls received.
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
There are 4 entrances to a building in Philadelphia. The bldg maintenance super would like to know if the entrances are equally utilized. To investigate, 400 people were observed entering the building.
an economy consists of the three sectors agriculture energy and manufacturing. for each 1 worth of output the
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