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A drug is suspected of causing an elevated heart rate in a certain group of high-risk patients. Twenty patients from the group were given the drug. The changes in heart rates were found to be as follows.
-1 8 5 10 2 12 7 9 1 34 6 4 12 11 2 -1 10 2 8
Construct a 95% con?dence interval for the variance of change in heart rate. Assume that the population has a normal distribution and interpret.
a college student is taking two courses. the probability she passes the first course is 0.71. the probability she
To determine monthly rental prices of apartment units in San Francisco Bay area, samples were constructed in the following ways. Identify the technique used to produce each sample. (cluster, convenience, random, stratified, systematic):
1. a noted psychic was tested for esp. the psychic was presented with 200 cards face down and was asked to determine if
At the 0.05 level of significance can it be concluded that the population mean height of treated plants is difference from 38 centimeters?
Is there enough evidence to believe that the average credit card debt has increased? Use a=0.05. Give a possible reason as to why or why not the debt was increased.
A normal distributed population has a mean of 250 pounds and a standard deviation of 10 pounds. Given n = 20, what is the probability that this sample will have a mean value between 245 and 255 pounds?
consider problem 5.71 regarding telephone calls made independently of each other. find an example through a web search
A. Determine the regression equation. B. Determine the estimated sales if 40 contacts are made.
Normally distributed with a mean of 113 grams and a standard deviation of 5.4 grams. Find the probability that if 7 bags are randomly selected, their mean weight exceeds 114 grams.
doctors have developed three new procedures ab and c for treating certain types of cancer known as adenocarcinomas and
Using data from Boston, Massachusetts, a test of independence is run on the claim that ice cream sales per month and the number of car wrecks per month are independent. The claim is rejected.
One possible explanation for why some birds migrate and others maintain year round residency in a single location is intelligence.
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