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Find the variance and the standard deviation. Here are the scores on the first exam in an introductory statistics course for 10 students:
80 73 92 85 75 98 93 55 80 90
Find the variance and the standard deviation for these first-exam scores.
What is the minimum sample size required by this student, given that no prior estimate of the population proportion is available?
Create a simple scatterplot of the relationship between these variables (define interview scores as the x-axis and behavioral ratings as the y-axis).
based on table please evaluate the mean wait time and throughput rate for the following situations when using
Dividend is expected to grow 7% a year for next 3 years and then at 5% a year after that. Determine the expected dividend per share for each of the next five years?
The value of σ is substantially affected by the duration of the lead time. In particular σ, increases as the lead time increases. The purpose of this problem is to enable you to explore this relationship further.
In recent years, fishermen have suffered financial hardship because of shortened fishing seasons, reduced catches and lower market prices. Moreover, fishermen have complained about price fluctuations and have called for a system of minimum prices.
Calculate the odds of bird defects in the two groups and the corresponding odds ratio. Interpret the OR in the context of the study.
The number of planes arriving per day at a small private airport is a random variable having a Poisson distribution with λ = 28.8. What is the probability that the time between two such arrivals is at least 1 hour?
How many items would have to be produced in a batch to guarantee that a batch consists of no more than 1% defective items?
Prepare a time series plot, ACF and PACF for these data. Is there evidence to suggest that the data should be differenced? Explain.
The owner of a car dealership wants to determine whether there is a relation between the income level and the type of vehicle purchased in their dealership.
Display the two sets of data on separate dot plots. Comment on the shape of these distributions and where they center. Why is the center an important point to consider?
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