In the past, monthly sales for HOOPS, a small software firm, have averaged $20,000 with standard deviation $4000. During the most recent year, sales averaged $22,000 per month. Does this indicate that monthly sales have changed (in a statistically significant sense at the 5% level)? Assume monthly sales are at least approximately normally distributed.
Answer to relevant QuestionsTwenty people have rated a new beer on a taste scale of 0 to 100. Their ratings are in the file P09_62.xlsx. Marketing has determined that the beer will be a success if the average taste rating exceeds 76. Using a 5% ...The file P02_16.xlsx contains traffic data from 256 weekdays on four variables. Each variable lists the number of arrivals during a specific five-minute period of the day. Use one-way ANOVA to test whether the mean numbers ...There is a lot of concern about “salary compression” in universities. This is the effect of paying huge salaries to attract newly-minted Ph.D. graduates to university tenure-track positions and not having enough left in ...The human resources manager of DataCom, Inc., wants to examine the relationship between annual salaries (Y) and the number of years employees have worked at DataCom (X). These data have been collected for a sample of ...The file P02_12.xlsx includes data on the 50 top graduate programs in the United States, according to a recent U.S. News & World Report survey. Columns B, C, and D contain ratings: an overall rating, a rating by peer ...
Post your question