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Question: Raising pay. Suppose that the teachers in the previous exercise each receive a 5% raise. The amount of the raise will vary from $1500 to $3000, depending on present salary. Will a 5% across-the-board raise increase the spread of the distribution as measured by the distance between the quartiles? Do you think it will increase the standard deviation? Explain your reasoning.
A sample of 40 ovservations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observers is selected from a second population.
problem one the manager of a catering company is using the number of people in the party to predict the cost of the
During the course of a year, 38.0% of the 213 merchant ships lost were general cargo carriers, while 43.8% of the 219 ships lost during the following year were in this category.
Explain the basic role that between-sample variation and within-sample variation play in carrying out an analysis of variance.
listed below are measured amounts of lead in micrograms per cubic meter or ugm3 in the air. the epa has established an
a deck of cards is shuffled and you choose one at random observe its colour and replace it in the set. the cars are
In a recent year, Delaware had the highest per capita annual income with $51,803 (µ = 51,803) . If σ = $4850, find the mean that falls at the 85th percentile for a sample of 35 residents?
Find the sample mean and sample standard deviation of the amount citizens spend per year. When finding a confidence interval for the true mean spent of ALL citizens, should we use a z-score or a t-score? Why?
Describing the ANOVA model, continued. For each of the following situations, identify the response variable and the populations to be compared, and give I, the ni, and N.
scores on an exam follow an approximately normal distribution with a mean of 76.4 and a standard deviation of 6.1
Determine the regression line. What do the coefficients tell you about the relationship between the two variables? Does it appear that the errors are normally distributed? Explain.
when a certain manufacturing process is correctly adjusted the length of a machine part produced is a random variable
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