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【正文】 root of variance: Sample Standard Deviation ? ?12????nXXxiSCopyright 169。 2022 by Harcourt, Inc. All rights reserved. Mean Squared Deviation nXX i? ?2)(Copyright 169。 2022 by Harcourt, Inc. All rights reserved. The Range as a Measure of Spread ? The range is the distance between the smallest and the largest value in the set. ? Range = largest value – smallest value Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Number of Sales Calls Per Day by Salespersons Number of Salesperson Sales calls Mike 4 Patty 3 Billie 2 Bob 5 John 3 Frank 3 Chuck 1 Samantha 5 26 Copyright 169。, population。 2022 by Harcourt, Inc. All rights reserved. Frequency Distribution of Deposits Frequency (number of people making deposits Amount in each range) less than $3,000 499 $3,000 $4,999 530 $5,000 $9,999 562 $10,000 $14,999 718 $15,000 or more 811 3,120 Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Copyright 169。 2022 by Harcourt, Inc. All rights reserved. What does Statistics Mean? ? Descriptive Statistics – Number of People – Trends in Employment – Data ? Inferential Statistics – Make an inference about a population from a sample Population Parameter Versus Sample Statistics Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Making Data Usable ? Frequency Distributions ? Proportions ? Central Tendency – Mean – Median – Mode ? Measures of Dispersion Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Measures of Central Tendency ? Mean Arithmetic Average – 181。 2022 by Harcourt, Inc. All rights reserved. Copyright 169。 2022 by Harcourt, Inc. All rights reserved. Measures of Dispersion or Spread ? Range ? Mean absolute deviation ? Variance ? Standard deviation Copyright 169。 2022 by Harcourt, Inc. All rights reserved. 150 160 17
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