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LongLast Inc. produces car batteries. The mean life of these batteries is 60 months. The distribution of the battery life closely follows the normal probability distribution with a standard deviation of 8 months. As part of its testing program, LongLast tests a sample of 25 batteries. What is the standard error of the mean?
Smith Software Inc. is a computer software firm that has grown in size in recent years. To assist in its planning for future growth, you are to determine the trend of the number of accounts based upon the below.
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
Comment on their success or failure to meet this goal.
Determine the probability that person's monthly gasoline (gallon) purchases will be less than 67 gallons.
At.05 level of significance, is there evidence to propose that mean life length of batteries produced by this manufacturer is more than 400 hours?
What is the probability that the first card dealt is an ace of spade?
Compare the differences of Simple random sampling & Cluster sampling using specific examples, and show the pros and cons of each method.
Given a normal distribution with a mean of 100 and a standard deviation of 10, what is the probability that
Compute standard error of mean? Compute the margin of error, with 95% confidence.
The following data represent the number of weed-eaters sold per month at a local garden shop and their prices
Assume that Leo advertises "If it takes more than 30 minutes to get your pizza, you get it free". What percentage of his take-out pizzas will have to give away free?
Calculate a four-quarter weighted moving average for the number of America Online (AOL) subscribers for the nine quarters of data. The data are reported in thousands.
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