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Question: Two types of phone operating system are being tested to determine if there is a difference in the proportions of system failures (crashes). Fifteen out of a random sample of 150 phones with OS1 had system failures within the first eight hours of operation. Nine out of another random sample of 150 phones with OS2 had system failures within the first eight hours of operation. OS2 is believed to be more stable (have fewer crashes) than OS1.
1. Is this a test of means or proportions?
2. What is the random variable?
3. State the null and alternative hypotheses.
4. What is the p-value?
5. What can you conclude about the two operating systems?
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You draw 13 cards and not one of them is Saddam Hussein [note: this is a tough one, remember to show your work so you can get partial credit. Grading will be lenient on this one].
given that the scores on a medical test follow a normal distribution with a mean of 460 and a standard deviation of
the average life expectancy in the united states l has been rising steadily over the past few decades as shown in the
Compute a 90% confidence interval of the mean for a Weschler intellegence test with mean of 100.00 and standard deviation of 15.00 for a sample of 100 people. Use two decimal places.
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Suppose we wish to test. H0: the X and Y distributions are identical versus Ha: the X distribution is less spread out than the Y distribution The accompanying figure pictures X and Y distributions for which Ha is true.
Based on the characteristics of the population, the expected number of grill owners in the sample was 180. What are the values of π, p, and n?
If A and B are independent events with P(A) = 0.4 and P(B) = 0.6, then P(A∩B) is
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