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Q1) According to Information Almanac. 80% of adult smokers started smoking before turning 18 years of age. Assume 10 smokers, 18 years of age or older are arbitrarily chosen and number of smokers who started smoking before 18 is recorded.
i) Determine the probability that exactly 8 of them started smoking before 18 years of age.
ii) Determine the probability that at least 8 of them started smoking before 18 years of age.
iii) Determine the area under the standard normal curve that lies between z=-2.55 and 2.55
iv) Determine the Z score such that the area under standard normal curve to the left is 0.85
v) Determine the probability P (Z<-0.61).
What is the probability of drawing one or more aces after discarding 5, 7, 8, and 9
At the .05 significance level, can we conclude that there is a difference in their mean times?
The ANOVA procedure is a statistical approach for determining whether or not:
P-value to test hypotheses,
Find the value of the standard normal random variable z, called z 0 such that:
If a complete failure occurs, calculate the probability that the fault occurred in:
Find the percentage of buyers who said their price range is between $150,000 and $153,300.
What can be completed to remedy multicollinearity.
What is the p-value associated with the above sample result?
Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
It is impossible to obtain a standard error less than 2 for any sized sample.
The calculated Z test statistic is a positive value that leads to a p-value of .045 for the test. If the significance level (α) is .01, the null hypothesis would be rejected.
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