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The figure for this exercise is a boxplot comparing tip percentages for a male and a female restaurant server, each of whom drew happy faces on the checks of randomly selected dining parties. A dotplot of the data was given as the figure for given Exercise. Discuss the ways in which the tip percentages for the two servers differed.
Exercise In an experiment, one female and one male restaurant server drew happy faces on the checks of randomly chosen dining parties. The figure for this exercise is a dotplot comparing tip percentages for the female (n = 22 checks) to the tip percentages for the male (n = 23 checks).
a. Compare the two servers with respect to the approximate centers (locations) of their tip percentages.
b. Compare the two servers with respect to the variation (spread) among tip percentages.
c. Explain whether you think there are any outliers in the dataset or not. If you think there are outliers, give their approximate values.
A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean.
The manufacturer of a new line of ink jet printers would like to include as part of their advertising the number of pages a user can expect from a print cartridge.
Suppose that the null hypothesis is rejected and alternate hypothesis is accepted. Discuss the conclusion as a Type I error, a Type II error, or a correct decision, if in fact the defendant is innocent.
You read in a book on poker that if you hold a pair (two cards of the same rank) in your hand, the probability of getting four of a kind is 2/245.
If we assume that the distribution of ages is mound-shaped and symmetric. What percentage of the respondents will be between 64.29 and 93.54 years old?
The samples do indicate that university A's students are younger than university B's; but is the difference significant at the 1% level?
Assume a restaurant business succeeds 60% of the time. Suppose that there are three such restaurants open in your city. When they don't compete with one another
Do hotel managers on average vary significantly in femininity score from men in general?
Preference to change blades is recorded. Do the data support the twin-blade manufacturer's claim? α=.05. This is a t-tests independent samples.
Bob enjoys making candy and some friends have encouraged him to open a candy-making business. To see if the local citizens buy enough candy,
a simple random sample of size n 125 is obtained from a population whose size is n 10000 and whose population
A board game enthusiast wonders whether the die provided in her board game is fair. She rolls the die 25 times and observes "6" only one time. State the relevant statistical model and hypotheses. Calculate the p-value and provide a conclusion. ..
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