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Q1) To test null hypothesis that average lifetime for the particular brand of bulb is 725 hours versus alternative that average lifetime is dissimilar from 725 hours, sample of 100 bulbs is used. If standard deviation is 50 hours and α is equal to 0.01, what values for mean x will result in rejection of null hypothesis.
Q2) A study was performed to evaluate mean amount spent on birthday gifts for typical family having two children. Sample of 145 was taken, and mean amount spent was $240. Suppose a standard deviation equal to $50, determine 99% confidence interval for μ, mean for all such families.
Given that the student you choose is a senior, find out the probability of selecting a non-senior?
Compute the sample variance and the sample standard deviation for these data (to 2 decimals).
In which of the following situations is bootstrapping (and other resampling methods) often used and Which of the following is a valid description of the bootstrapping method.
For each problem, compute a Welch F-statistic and determine whether or not significant differences exist among the treatment conditions.
To select a _________ sample, an intact group of subjects that represent the population is selected.
For following scores determine values of each expression: X: 4, 2, 1, & 5. åX, åX 2 , (åX) 2 , å(X-1).
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
What happens to the expected return and standard deviation of returns of the portfolio in Part a if the following conditions exist?
The chance both flights are full is 0.6. Are the two flights being full independent events and What was the mean ranking for the females in this class
Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
By using.02 level of significance, carry out a 5-step hypothesis testing procedure to find out if new processes considerably reduced the wait time.
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