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An interviewer is asked to obtain answers to a survey on shopping habits from 50 people, 25 of each gender. She positions herself outside a major shop in the town centre at 9 a.m. on a Monday morning and starts interviewing people one by one. Discuss this approach in class. Can you identify some of the problems this study raises?
In an instrumentation system, there is a need to take the difference between two signals, one of v1 = 2sin(2π × 60t) + 0.01 sin(2π × 1000t) volts and another of v2 = 2sin(2π ×60t)-0.01 sin(2π ×1000t) volts.
For one consumer product the mean dollar sales per retail outlet last year in a sample of 15 was $3,425 with a standard deviation of $500. For a second product the mean dollar sales per outlet in a sample of 12 stores was $3,250 with a standard de..
Find Karl Pearson's correlation coefficient between the sales and expenses from the data given below: Sales (Rs. Lakhs) 50 50 55 60 65 65 65 60 60 50 Expenses (Rs. Lakhs) 11 13 14 16 16 15 15 14 13 13?"
car rental rates per day for a sample of seven eastern u.s. cities are as follows the wall street journal january 16
Quadratic equations can be solved by graphing, using the quadratic formula, completing the square, and factoring. What are the pros and cons of each of these methods?
What is the probability of selecting someone at random from this population who has a cholesterol value less than 180? What is the mean and the standard deviation (error) of?
the downtown parking authority of tampa florida reported the following information for a sample of 241 customers on the
the median of a continuous random variable having distribution function fx is that value m such that fm 0.5. that is a
Which of the following statements is not true of the null hypothesis? A) It is your theory B) It is what you would expect by chance alone C) Assumes things to be equal D) None of the above
organize the interval scores below in a table showing simple frequency cumulative frequency and relative frequency. 16
Compute the sample variance and sample standard deviation as a measure of volatility of monthly total return for Chevron (to 2 decimals): Sample variance and Sample standard deviation.
Professor Smith's statistics midterm had a mean of 85 and a standard deviation of 8. If a student got a score of 73, what was the student's standardized (z) score? What is the probability of a normal random variable taking a value more than 1.6 sta..
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