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The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Evaluate the mean wait time and throughput rate
Using the following data on 15 workers, construct an exact 95% confidence interval for µ.
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots. A partial ANOVA table
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
The Minitab output for the Tukey Least Significant Difference multiple comparisons is below. Which means are different and similar
What is the probability that they all hit the target?
If the standard deviation of the amount of coffee dispensed is 0.4oz and the amount of coffee dispensed is normally distributed.
The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
Which of the following studies used a participant observer approach?
What is the probability that the cereal would be high fiber? In other words, what is P (high fiber)?
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
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