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Chapter 1: Q2-12BSC (page 1)

Identify whether the given value is a statistic or a parameter.

Periodic table The average (mean) atomic weight of all elements in the periodic table is 134.355 unified atomic mass units.

Short Answer

Expert verified

The value of the average atomic weight calculated for all elements present in the periodic table is equal to 134.355 unified atomic mass units and represents a parameter.

Step by step solution

01

Given information

In the periodic table, the mean atomic weight (in unified atomic mass units) of all the elements equals 134.355.

02

Statistic and parameter

Numbers that summarise a population under study are called parameters. For example, the average height of all American men is equal to 5 feet and 9 inches. This is a parameter.

Numbers that summarise a sample selected from a population are called statistics. For example, the average capacity of a sample of 30 tanks is equal to 1000 gallons. This is a statistic.

03

Identification of statistic and parameter

Since the average atomic weight (in unified atomic mass units) equal to 134.355 is calculated for all elements present in the periodic table, it is aparameter.

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Most popular questions from this chapter

Quantitative/categorical DataIdentify each of the following as quantitative data or categorical data.

a. The platelet counts in Data Set 1 “Body Data” in Appendix B.

b. The cigarette brands in Data Set 13 “Cigarette Contents” in Appendix B.

c. The colours of the M&M candies in Data Set 27 “M&M Weights” in Appendix B.

d. The weights of the M&M candies in Data Set 27 “M&M Weights” in Appendix B.

Determine whether the sampling method appears to be sound or is flawed.

Clinical Trials. Researchers at Yale University conduct a wide variety of clinical trials by using subjects who volunteer after reading advertisements soliciting paid volunteers.

In Exercises 21–24, refer to the data in the table below. The entries are white blood cell counts (1000 cells,ML) and red blood cell counts (million cells,ML) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.

Subject


12345
White8.75.97.36.25.9
Red4.915.594.444.85.17

Conclusion: If we analyze the sample data and conclude that there is a correlation between white blood cell counts and red blood cell counts, does it follow that higher white blood cell counts are the cause of higher red blood cell counts?

Falsifying Data A researcher at the Sloan-Kettering Cancer Research Center was once criticized for falsifying data. Among his data were figures obtained from 6 groups of mice, with 20 individual mice in each group. The following values were given for the percentage of successes in each group: 53%, 58%, 63%, 46%, 48%, 67%. What’s wrong with those values?

Doughnuts and Fat. A classic study, conducted in 1935 by B. Lowe at the Iowa Agriculture Experiment Station, analyzed differences in the amount of fat absorbed by doughnuts in cooking with four different fats. For the experiment, 24 batches of doughnuts were randomly divided into four groups of 6 batches each. The four groups were then randomly assigned to the four fats. What type of statistical design was used for this study? Explain your answer.
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