# Choose the correct answer below with cluster sampling

• 8
• 97% (35) 34 out of 35 people found this document helpful

This preview shows page 5 - 7 out of 8 pages.

Choose the correct answer below. With cluster sampling, all members of randomly selected subgroups (or clusters) are selected, but with stratified sampling, samples from each of the different subgroups (or strata) are selected.
1.1.3 What is a sample statistic, what is a population parameter, and what is the difference between them?
What is a population parameter?
What is the difference between a sample statistic and a population parameter?
2.2.28 Assume that a statistics professor has a height of exactly 161.7 cm. Assume that this height is measured with a tape measure that can be read to the nearest mm (or 1/10 cm) and results from two different measurements are reported as 162 cm and 161.1 cm. Which measurement is more precise? Which is more accurate? Explain Identify which measurement is more precise and explain why. The measurement of 161.1 cm is more precise, because it has more decimal places. Identify which measurement is more accurate, and explain why. The measurement of 162 cm is more accurate, because it is nearer to the true value. 3.4.13 The accompanying graph shows the minimum wage in a certain country, together with its purchasing power, which is adjusted for inflation with 1996 used as the reference year. The graph represents the years from 1955 to 2011. Summarize what the graph shows. The minimum wage has steadily increased since 1955. The purchasing power of the minimum wage increased until the late 1960s, then decreased until the late 1980s, and has been relatively stable in recent years. 4.1.21 The following table gives the total area in square miles (land and water) of seven states. Complete parts (a) through (c). State Area 1 52,200 2 615,800 3 114,600 4 53,500 5 158,900 6 104,700 7 6,000 a. Find the mean area and median area for these seven states. The mean is 157,957 square miles, the median is 104,700 square miles b. Which of these seven states is an outlier on the high end? If you eliminate this state, what are the new mean and median areas for this data set? State 2 is an outlier on the high end. The new mean is 81,650 square miles. The new median is 79,100 square miles. c. Returning the outlier value from part (b) into the original data set, which of these seven states is an outlier on the low end? If you eliminate this state, what are the new mean and median areas for this data set? State 7 is an outlier on the low end. The new mean is 183,283 square miles. The new median is 109,650 square miles. 2.1.49 The heights left parenthesis in centimeters right parenthesis of a sample of a species of plant 30 days after sprouting are shown below.
• • • 