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1. An analyst decided to use either the 95% t-interval for the mean or the corresponding 95% interval for the median, whichever was shorter. His sample was symmetric, so the mean and median are roughly the same in his population. What do you think of this approach?
2. You have a very small sample, with n = 1. What is the chance that the median in the population is larger than your single value? Smaller?
If historical time series data is very limited, what type of forecasting approach would be useful.
The pie chart below shows the distribution of the citizens' answers. If there are citizens in the community, how many chose Birds, Hamsters, or Dogs?
Display the 95% prediction interval on the fitted line plot. Follow the same steps in part (b) except check Display prediction interval. Discuss how the intervals differ from each other and why. Construct residual plots for this model and interpr..
Suppose it is desired to estimate the population mean number of miles with a margin of error of ± 2 miles at 95% confidence. Do the data provide this desired level of precision? What action, if any, would you recommend be taken?
assume that a simple random sample has been selected from a normally distribution population and test the given claim.
During a recent year the average cost of making a movie was $54.8 million. This year, a random sample of 15 recent action movies had an average production cost of $62.3 million with a variance of $ 8 million.
Calculate the breakeven point in sales dollars using the contribution margin ratio approach. How many pizzas must be sold to earn $60,000 profit per annum before tax?
Suppose the number of tickets written per day follows a Poisson distribution with a mean of 6.5 tickets per day. Interpret the value of the mean. The mean has no interpretation since 0.5 ticket can never be written.
if an experimenter crosses intelligence with attractiveness in a factorial design in which intelligence has three
These problems related to Basic Statistics and discuss about type I and type II errors and their critical role in statistical tests
Does the data prove a significant difference in mean GPAs? GPA1 GPA for Randomly Selected Students in Four Business Majors.
Analyzing the relationship between GDP per Capita and State of Peace. Data points where any of the 2 variables are unavailable will be removed. GDP per capita will be on the vertical column, and state of peace will be on the horizontal column.
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