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You are a new manager at al lowbucks coffee shop. Your workers are already complaining! They want you to hire more help. They claim that they are having to make at least 200 cups of coffee an hour. You doubt that, so you take a sample over a few hours and find that over a four hour period one Friday afternoon, the workers averaged 191 cups of coffee per hour, with a standard deviation of 6 cups. Using a significance level of 0.05, perform a hypothesis test to see if the workers are right, and you need to hire more help. Write your hypotheses, calculate your test statistic and decide whether or not to reject your null.
Compute the appropriate test statistic to test Ho: p = 80/100 vs. Ha: p > 80/100.
Determine probability of waiting less than 12 minutes between successive speeders. By using cumulative distribution function of X.
The analysis of variances produces df between = 3 and df within = 24. For this analysis, determine df total ?
Given that Z is standard normal randam variable. Compute the value of Z if area between –Z and Z is 0.754:
Two groups of students are asked to rank their preference for six types of soft drinks. The following table shows their rankings.
Multiple choice question using Forecasting techniques. Which among of the following models are best suited to forecast a time series with a stable seasonality component.
At alpha = 0.05, is there enough evidence to conclude that proportions vary from those in the study?
To findout the point estimate of the difference among population mean. Elucidate the percentage increase in the number of days on the disabled list.
Their resting heart rates were measured. A partial ANOVA table is given.
Construct the 90% confidence interval for the true population proportion of all voters in the state who favor approval.
A month is classified as "extremely wet" if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as "extremely wet".
Consider a binomial distribution with 15 identical trials, and a probability of success of 0.5. Use the normal approximation to find the probability that x = 2.
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