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Errors in estimates in a large sports company's monthly budget are known, from long experience, to follow a normal distribution with a standard deviation of 800. what sample size would be required to be 95% certain of estimating the mean error to within 150 of the true value?
By using standard normal table, determine critical value (or values) for= 0.14 right-tailed test.
"MagTek" electronics has developed a smart phone that does things that no other phone yet released into the market-place will do. The marketing department is planning to demonstrate this new phone to a group of potential customers, but is worried abo..
We are doing a team project for our statistics class and our project is about "Math Anxiety". We are stuck on one question and the questions is "the teams will state the null and alternative hypotheses
what are the probability of you having the disease?
Student A and B took different statistics classes and 2 different finals. Student A had a score of 83 out of 100 and ranked 72 in his class. Student b scored 85 out of 100 and he ranked in the 70 percentile of his class.
What can we say about the form or way of the distribution of the average or median of the sample?
he standard deviation of the sample proprortion is 5.3%. How large a sample (to the nearest person) would be required to reduce this standard deviation to 3.7%?
A soft-drink manufacturer claims that its 12-ounce cans do not contain, on average, more than 30 calories. A random sample of 16 cans of this soft drink, which were checked for calories
A month of sales data are collected on sales of different types of computer products Run the t-tests to determine:
A sociologist wants to describe if the life expectancy of people in Africa is lesser than the life expectancy of people in Asia.
One professor teaches a large section, section A, of a particular class, and on the first test of the term, the test scores in section A were approximately normally distributed with a mean of 78 and a standard deviation of 6.
If he selects the three brands at random, what is the probability that he will select the following?
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