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Consider the following hypothesis test:
H0: Mean <=12Ha: Mean > 12
A sample of 25 provided a sample mean of 14 and a sample standard deviation of 4.32.a. What is the value of "t" for this sample?b. For a 95% confidence level, what is the critical value of "t"?c. What do you conclude?
A university found that 20 percent of its students withdraw without completing the introductory statistics course. 20 students registered for a section of the course this term.
For the following data, determine whether or not right-hemisphere damage results in significantly reduced performance on the spatial skills task. Test with alpha set at .05 with one tail. The data are as follows:
A loaf of bread is normally distributed with a mean of 22 oz. and a standard deviation of 0.5 oz. What is the probability that a loaf is less than 22.25 oz.?
a) What statistical test should be used to analyze these data? b) Identify H0 and Ha for this study. c) Conduct the appropriate analysis d) Should H0 be rejected? What should the researcher conclude?
A jar contains marbles of different colors: 4 white, 6 black, 6 red, and 4 blue. On two random drawings, without replacement, find the probability that the first is black and the second is white.
In determining automobile mileage ratings, it was found that the mpg in the city (x) for a certain model is normally distributed, with a mean of 24 mpg and a standard deviation of 1.0 mpg. Find the following:
A data source generates hexadecimal characters. Let X be the integer value corresponding to a hex character. Suppose that the four binary digits in the character are independent and each is equally likely to be 0 or 1.
Assume that the annual rate of return for a common biotechnology stock is normally distributed with a mean of 5.5% and a standard deviation of 6%.
What is the probability that a visually impaired student gets less than 6.9 hours of sleep?
Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30.
A design for 2 treatments has p pairs of blocks. Each block has three plots. In each pair one block has two plots with A and one with B, and the other has two plots with B and a single plot with A.
A survey of 1,233 visitors to Mumbai last year revealed that 110 visited a small cafe during their visit. Laura claims that 10% of tourists will include a visit to a cafe.
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