Question

1. On a job interview you ask the employer what would the starting salary be. The interviewer says, "the average starting salary in my company will be $80,000."

You accept the job and find out your starting salary will be $30,000.

You and 6 co-workers have a starting salary of $30,000 while the CEO's son has a starting salary of $430,000! The average (mean) is $80,000.

You think this is a misuse of statistics because the employer should have used

a).a sample instead of the entire population (suspect samples)

b).a different average like the median (ambiguous average)

c). a lie detector

2.  

The mean of the grades: 100, 90, 100, 70, and 100.

is 92.

True or False

3. Match the key terms with their definitions.

a)the certainty that the observations in our sample group are accurate measures of the characteristics we set out to measure

b)a sample drawn from a population such that each and every member of the population has an equal chance of being included in the sample. Also, every sample of the same size has an equal chance of being selected.

c)being sure that our methods and presence in no way jeopardize our ability to use the random sample as a true representative of the population

d) another term for consistency

e) a convenient method of organizing raw data into a table, using classes

f) a way to display the distribution when we want to emphasize the categories' relation to the whole

1. Pie chart 2. Frequency Distribution 3. Reliability 4. External Validity 5. Internal Validity 6. Random Sample

Answer 1

1)

ans: option B : a different average like the median (ambiguous average)

2)

The mean of the grades: 100, 90, 100, 70, and 100 is 92 : True

3)

a) the certainty that the observations in our sample group are accurate measures of the characteristics we set out to measure: Internal Validity

b) a sample drawn from a population such that each and every member of the population has an equal chance of being included in the sample. Also, every sample of the same size has an equal chance of being selected: Random Sample

c) being sure that our methods and presence in no way jeopardize our ability to use the random sample as a true representative of the population : External Validity

d) another term for consistency: Reliability

e)  a convenient method of organizing raw data into a table, using classes : Frequency Distribution

f) a way to display the distribution when we want to emphasize the categories' relation to the whole : Pie chart