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An email spam filter checks an incoming email for a list of key words. If enough of these key words are present, then the email is automatically sent to the spam folder. The filter is 95% accurate in correctly identifying a spam email, but will incorrectly send a non-spam email to the spam folder with probability 0.5%. Previous data suggests that 4% of emails are spam emails.
A) What is the probability that a randomly selected email will be labelled as spam?
B) Use your result from A to determine the probability that an email which has not been identified as spam is actually a spam email.
C) The developers of the spam filter wish to reduce the probability in part B to 0.1%. What should the probability of the filter correctly identifying a spam email be increased to so that this objective is reached?
You want to know whether the population means are different in the two populations. Conduct an hypothesis test using an alpha of .05 and the critical value method.
Compare two month moving average also exponential smoothing using MAD. The subsiquent data represents demand for company ABC's products for the last 10 months.
Calculate the test statistic, and interpret the result, calculate the p-value, and interpret the result and determine the rejection and non-rejection regions.
suppose the amount of time it takes a popcorn kernel to pop is normally distributed with a mean of 150 seconds and a
Draw the distribution of the random variable X, representing her time of arrival. (Be sure to include labels and values on the axes.)
A brand of television has a lifetime that is normally distributed with a mean of 7 years and a standard deviation of 2.5 years. What is the probability that a randomly chosen TV
question abc airlines operates 50 seat planes between albany and boston. for tomorrows flight it has accepted 62
It is important for airlines to know the approximate total weight of the baggage carried on each airplane. An airline researcher believes that the mean baggage for each adult is 60 kg. To test his belief, he draws a random sample of 50 adult passenge..
The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected
A seed distributor claims that 80% of its beet seeds will germinate. How many seeds must be tested for germination in order to estimate p, the true proportion that will germinate, so that the maximum error of the estimate is " = 0:03 with 90% con ..
An advantage of the permutation test over the t test for a difference in means, can Permutation tests be used for tests when we believe the two populations differ under the null hypothesis.
Using one mean t test to determine whether or not to support the claim - hypothesis test that WORKS THE SAME as the z-test
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