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Ten asthmatics were asked to compare the effect of salbutamol and fenoterol sprays in relieving their asthma attacks. Assume that salbutamol and fenoterol are equal in terms of effectiveness and side effects in all people, so that the preferences expressed are simply the reflection of a 50-50 random choice.
a. With this assumption, what is the probability that
i) zero people prefer fenoterol to salbutamol?
ii) one prefers fenoterol?
iii) two prefer fenoterol?
iv) three prefer fenoterol?
v) four prefer fenoterol?
vi) five prefer fenoterol?
At.01 significance level, is there relationship between job pressure and age?
If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
Find the range, standard deviation, and variance for the scores.
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
If we want to increase our confidence level from 95% to 99%, what happens to our confidence interval?
Standard deviation of 7. At 0.01 significance level, is there more variation in first population?
In studying the performance of the comapany's stock investments over the past year, the research manager of a mutual fund company finds that only 43% of the stocks returned more than the rate that had been expected at the beginning of the year.
When creating a 99% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error?
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
Find the probability of exactly 6 Mexican-Americans among 12 jurors.
A population of data from a paper supply company is known to have a mean weight of 55 ounces per ream and a population standard deviation of 5 ounces. The population is known to be bell shaped and symmetrical. Which of the following statements is ..
A portfolio p of consisting 60% of stock X and 40% of stock Y, has a correlation ρpM = 0.62 with the market. What is the portfolio volatility? Statement on the diversification effect.
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