$1)$ Define these terms:

$$ Internal Validity

$$ External Validity

$$ Random Sample

$$ Reliability

$$ Frequency Distribution and

$$ Pie Chart.

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$2)$ Find the mean of the grades: $100,90,100,70,$ and $100.$

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$3)$ On a job interview you ask the employer what the starting salary will 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 what?