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Sentinal Phoneback answers customer enquiries with telephone calls. When they timed a sample of 40 calls, they found a mean duration of 14.9 minutes and a standard deviation in duration of 2 minutes. What are the 95% and 99% confidence intervals for the true length of calls?
Consider that you are a line manager in your current Corporation. There is a 0.50 probability that you will be promoted this year. There is a 0.65 probability that you will get a promotion or a raise. The probability of getting a promotion and a r..
Identify the sensitivity ranges for the profit of a sausauge biscuit and the amount of saisage available. Explain these sensitivity ranges
A leasing firm claims that the mean number of miles driven annually,M , in its leased cars is less than 13020 miles. A random sample of 90 cars leased from this firm had a mean of 12750 annual miles driven.
When creating a 99% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error?
Sample mean is 50, t-statistic is 1.96, and standard error of sample mean is 2. Determine the 95 percent confidence interval?
Given a level of confidence of 99% and a population standard deviation of 10, what other information is necessary:
Is it necessary to assume a normal distribution on the population to estimate the value of the mean spending per day? Explain.
Heights are sampled of kids from three schools. Using a 0.05 significance level, if when looking at ANOVA results, your p-value is 0.04, what can you say about your sample data? no minimum word count.
How large a sample should she check in order to be 90% confident that the true proportion is estimated to within 1.5%?
Pollsters attempt to find out whether or not person is a "likely voter" before they count their opinion in poll. If we suppose 40% of registered voters will really vote.
Estimated proportion is within 2.5 percentage points of the true proportion. A previous poll suggests that the proportion is 85%. How large must your sample be?
Determine the coefficient of correlation and the coefficient of determination. please show your calculations. Interpret the results.
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