Random quessing-number of correct
A multiple-choice test consists of 77 questions with possible answers of a, b, c, d, e. Estimate the probability that with random quessing, the number of correct answers is at least 33.
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A fair coin is tossed 20 times and x=6 heads are observed. Let p=P(head). A test of Ho:p=.5 versus Ha: p<.05 is to be performed based upon the results of the 20 tosses. What is the p-value for this hypothesis test?
It is estimated that 56% of the children between the ages of 3 and 5 years are already enrolled in school. In a sample of 150 children what is the probability that exactly 100 are enrolled in school?
About 34% of Americans have type A+ blood. A blood drive gets 140 donors. What is the probability that at least 40 of them are A+ blood donors?
An airline company is considering a new policy of booking as many as 178 persons on an airplane that can seat only 170. Past studies have revealed that only 84% of the booked passengers actually arrive for the flight.
A fair coin is tossed 500 times. Find the probability of obtaining more than 300 heads.
A sample of 850 people resulted in a confidence interval estimate for the proportion of people who believe that the Fed. Gov.'s proposed tex increse is justified is between .14 and .20. Based on this info, what was the confidence level used in
It is estimated that there are 30 depths for every 10 million people who use airplanes. a company that sells fight insurance provides $100000 in case of depth in a plane crash. a policy can be purchases for $1. Calculate the expected value and the
Do you have sufficient evidence to conclude that the mean amount of caffeine consumed dsily by college students is less than 250mg? (Enter yes or no)
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