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A chemical engineer desiring to study the evaporation rate of water from brine evaporation beds obtained data on the number of inches of evaporation in each of 55 July days spread over 4 years. The data are given in the following stem and leaf plot, which shows that the smallest data value was .02 inches, and the largest .56 inches.
.0
2, 6
.1
1, 4
.2
1, 1, 1, 3, 3, 4, 5, 5, 5, 6, 9
.3
0, 0, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 5, 5, 6, 6, 7, 8, 9
.4
0, 1, 2, 2, 2, 3, 4, 4, 4, 5, 5, 5, 7, 8, 8, 8, 9, 9
.5
2, 5, 6
Find the
(a) sample mean;
(b) sample median;
(c) sample standard deviation of these data.
(d) Do the data appear to be approximately normal?
(e) What percentage of data values are within 1 standard deviation of the mean?
Replacement times for new Ford Taurus GL automobiles are normally distributed with a mean of 7.1 years and a standard deviation of 1.4 years.
What is the approximate distribution of the mean NOX emission level x for these cars? (b) What is the level L such that the probability that x is greater than L is only 0.01?
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
Obtain a 95% confidence interval for the mean monthly rent for two-bedroom apartments. Assume that measurements are normally distributed. Round to two decimal places.
Statistics means never having to say you"re certain." What defines the cohort? All patients from a particular healthcare plan?
Use α =.01 and test for a significant difference. What is your conclusion?
What symbol is used to represent the mean of the sampling distribution of y-(ybar)? Explain and what symbol is used to represent one value from the sampling distribution of y-(ybar)? Explain
A sample has just been taken with the following lengths: 21.25, 22.0, 21.5, 20.75, 21.25, 21.35, 21.35, 21.35, 21.35, 21.35, 21.35, and 21.35. Is the new seamstress performing at an acceptable quality level?
weight status category and the corresponding percentiles and bmi ranges for 10-year-old boys in the states table.weight
a rehabilitation center researcher was interested in examining the relationship between physical fitness prior to
The Ludlow Wildcats baseball team, a minor league team in the Cleveland Indians orgainzation, plays 70 precent of their games at night and 30 percent during the day.
1. tensile strength tests were carried out on two different grades of wire rod resulting in the accompanying datagrade
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