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Let x be a random variable that represents the length of time it takes a student to write a term paper for Dr. Adam's Sociology class. After interviewing many students, it was found that x has an approximately normal distribution with mean μ = 6.8 hours and standard deviation σ = 2.1 hours.
Convert each of the following x intervals to standardized z intervals:
a) x ≤ 7.5
b) 5 ≤ x ≤ 8
Convert each of the following z intervals to raw score x intervals:
c) z ≥ -2
d) 0 ≤ z ≤ 2
e) z ≤ 3
Provide a discussion that supports the assumption that the variance of savings increases with family income.
Which sessions, morning or afternoon, had more stable or uniform attendance over three-day period? Describe by using the suitable calculation for each data set and compare two calculations .
A teacher divides her class into two groups. One group is taught a lesson on the computer and the other is taught by traditional lecture. The teacher then gives a test to see that group has better grades.
Determine probability that student was sophomore? Determine the probability of selecting a face card from deck of 52 cards.
The following data represent the cost of electricity for the period of July 2008 for a random sample of 50 one-bedroom apartments in a large city.
Use the least-squares method to compute the regression of coefficients b0 and b1.
The dimension is supposed to be 224 mm and the variability of the manufacturing process is unknown. Is there evidence that the mean dimension is not 224 mm?
What is the probability that none are a commercial success?
Calculate the correlation coefficient and prediction equation.
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
Construct a 99% confident interval for the standard deviation of the amount of vitamin B6 per pill.
Using an alpha level of 0.05, please use SPSS to perform a one-way ANOVA and then determine whether the data below provide evidence for Theory A, Theory B, or Theory C. In other words, is one theory stronger than the others?
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