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On average, you receive 2 telemarketing calls per day. What is the probability that you will not receive any telemarketing calls today.
There is 0.4 probability that you will not receive a telemarketing phone call in one day. What is the expected number of telemarketing calls you will receive per day? What assumption do you make about the distribution?
The ABC company makes an electric appliance. The life of this appliance has a normal distribution with a mean of 72 months and a standard deviation of 9 months. The ABC company is to determine the warranty period of this appliance. If the appliance breaks down during the warranty period, the company will replace it free of charge. What should the warranty period be if the company does not want to replace more than 3% of the appliance?
What does confidence interval tell you? What does it mean? What 2 things can a researcher do to decrease width of a confidence interval? What are the effects?
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
Find out the probability distribution of your net winnings if you play one time. Calculate the mean and the standard deviation.
Fair die is rolled 10 times. Determine the probability that the odd number (1, 3 or 5) will occur less than 4 times?
This sample group has errors with a standard deviation of 54.7ft. At the 5% level of significance, test that the new population has errors with a standard deviation equal to 43.7ft.
For thefts involving more than $1,000, there is an inverse relationship between the value of the goods stolen and the length of the prison sentence given to the thief.
The mean television viewing time for Americans is 15 hours per week (Money, November 2003). Assume a sample of 60 Americans is taken to further investigate viewing habits. Suppose the population standard deviation for weekly viewing time is Q = 4..
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots. A partial ANOVA table
What type of error would result in that case? Respond to at least two of your classmate's postings.
Identify and justify which type of sampling (random, stratified, systematic, cluster, convenience) is used in the following examples.
Is the hot-air balloon significantly shorter than light rail? How can you tell? What do you tell university officials?
Formulate the hypotheses that can be used to determine whether union membership increased in 2006.
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