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According to Money, the average appreciation, in percent, for stocks has been 4.3% for the five-year period ending in May 2007.5 An analyst tests this claim by looking at a random sample of 50 stocks and finds a sample mean of 3.8% and a sample standard deviation of 1.1%. Using alpha = 0.05, does the analyst have statistical evidence to reject the claim made by the magazine?
Births. Randomly selected births records were obtained and results are listed in the table below (based on data from the National Vital statistics Report,
For many years TV executives used the guideline that 30 percent of the audience were watching each of the prime-time networks and 10 percent were watching cable stations on a weekday night.
A street performer approaches you to make a bet. He shows you three cards: one that is blue on both sides, one that is orange on both sides, and one that is blue on one side and orange on the other.
A person is considering purchasing the stock of two home health companies that are similar in all respects except the proportion of earnings paid out as dividends.
A 95% confidence interval for the proportion of all adults who bought a lottery ticket in the past year is (assume Gallup used an SRS)
Crete a 90% confidence interval for mean Secchi dish measurement.
By using the normal probability distribution, what is the probability the car will be repaired in 35 minutes or less?
Estimated sales resulting from a $15,000 investment in inventory and an advertising budget of $10,000. Interpret b1 and b2 in this estimated regression equation.
If the computed value for this problem is +2.33, and the level of significance is 0.05, can we conclude that the recall proportions for the two commercials are same?
A bookcase contains 3 statistics books and 4 biology books. If 2 books are chosen at random, find the chance that both are statistics books.
Do the data indicate that the sleeping pill is effective at a 1% level of significance?
Analysis of variance- One way classification - Are there differences among these 3 drugs with respect to how long they are retained in the body?
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