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Q1) Cell phone producer claims that its phone will last for more than eight hours of continuous talk time when battery is fully charged. To test this claim a sample of n = 18 phones were tested. Results illustrated a sample mean of 8.2 hours and sample standard deviation of 0.4 hours. Conduct hypothesis test using a 0.05 level of significance and find out whether or not company's claim is supported.
Q2) If hypothesis test for single population variance is to be conducted by using significance level of to 0.10, a sample size of n = 16, and test is a one-tailed upper-tail test, the critical value is:
i) z = 1.28.
ii) t = 1.345.
iii) x2= 22.3071.
iv) x2= 24.9958.
Start rolling dice until a particular number, say 3, is obtained, and keep track of how many rolls are necessary. Repeat 100 times. Then find the average.
Determine the probability that: a) Exactly 3 will have this mild side effect.
You listen to radio station for 1 hour, at arbitrarily selected time, and carefully observe that amount of advertising time is equal to 7 minutes. Compute z-score for this amount of advertising time.
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Select the level of significance, and determine critical, ZCR value.
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