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The length of pop music songs is normally distributed with mean length of 215 seconds and a standard deviation of 38 seconds. What percent of pop songs have lengths between three and four minutes?
a. What was the null hypothesis? b. What was the logic when rejecting this null hypothesis?
Find the probability that a randomly selected bolt can be used (either immediately or after being cut). Find the probability that fewer than 15 out of 20 bolts can be used.
The article "A Study of Wood Stove Particulate Emissions" (J. of the Air Pollution Control Assoc., 1979: 724-728) reports the following data on burn time (hours) for samples of oak and pine. Test at level .05 to see whether there is any difference..
the average return for large-cap domestic stock funds over the three years 2009-2011 was 14.8. assume the three-year
Is the association between these variables positive or negative? Explain why you expect the relationship to have this direction.
A random sample from a normal population yields the following 25 values: 90 87 121 96 106 107 89 107 83 92
For each of the following problems, assume that the homogeneity of variance assumption has not been met and that you will need to use the adjusted Welch statistic.
according to a recent survey of new jersey households the probability that the residents own 2 cars if annual household
Which test should we use to determine whether the difference between Mesa and Tempe is statistically significant? Why? Should it be one or two-tailed?
four automobiles have entered bubbas repair shop for various types of work ranging from a transmission overhaul to a
Research has shown that the major difficulties faced by companies include the lack of knowledge on innovation and technology
7 cards are drawn from a standard deck without replacement. What is the probability that at least one of the cards drawn is an ace? Express your answer as a fraction or a decimal number rounded to four decimal places.
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