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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?
The modem receiver takes a majority vote of the five received bits to estimate the input signal. Find the probability that the receiver makes the wrong decision.
Seven students have applied for merit scholarships. This year 3 merit scholarships were awarded. If a random sample of 3 aplications (from the population of 7) is selected,
Plot a scatter diagram of the results with Depth of Water as the independent variable.
Estimate the true proportion of incomplete files for ALL the bank's commercial loans. Write a statement about the confidence level and the interval you find.
Two hundred seeds of such a cross are raised, and 142 turn out to be blue-flowering. Are the data consistent with the model?
Market researchers would like to know if customers prefer a well-known brand over a generic brand of soft drink. They give a large sample of people the two drinks to taste in a random order and ask them which one tastes better.
Use a graphical technique to compare the ages, household incomes, and education of the five groups of car buyers. (Do not use Box plots or Stem-and-Leaf Display).
Suppose that you perform a significance test regarding a population mean, and that the evidence does not warrant rejection of the null hypothesis.
Perform a posthoc test that is suitable if we assume that group 7 is a control group and that the other are different treatment groups and that we are only interested in finding significant treatments, not to compare them.
Discuss the use of standard deviation. Explain how it might be useful to you in your research and how you would explain results using standard deviation.
Obtain the simple linear regression equation, then analyze the residuals by (a) constructing a histogram
35 people that spend on average less than 62 minutes per day on facebook? Assume this is normally distributed. Find the chances of each to decide which is more likely, and by how much.
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