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Biostatistics > Chapter 3 > Flashcards

Chapter 3 Flashcards

1
Q

Advantages and disadvantages of the mean

A

Adv : Takes every data value into account

Disadv : Sensitive to every data value

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2
Q

To find the mean from a frequency distribution

A

• اطلع الميد بوينتس
• اضرب الميد بوينت بالفريكونسي
• اجمع الناتج لكل اللي ضربتهم واقسمها على مجموع الفركونسي

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3
Q

To find the weighted mean

A

• Multiply the mean by the number of whatever كل سكشن
• Then divide it by the total of students or whatever

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4
Q

The middle value when the original data values are arranged in order of increasing

A

Median

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5
Q

• It’s not affected by an extreme value
• It’s a resistance measure of the center

A

Median

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6
Q

The value that occurs with the greatest frequency

A

Mode

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7
Q

What’s the measure of central tendency that can be used with nominal data?

A

MODE

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8
Q

Mode in frequency table

A

The midpoint of the class with greatest frequency

اكبر فريكونسي بالجدول نطلع الميد بوينت حقها واللي هي نجمعهم ونقسم على ٢

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9
Q

The value midway between the maximum and the minimum

A

Midrange

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10
Q

How to find the midrange?

A

Maximum + Minimum
Divide by two

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11
Q

Why is the midrange sensitive to extreme?

A

Because it uses only the maximum and the minimum values

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12
Q

How to find the midrange for frequency table

A

Lower class limit of first class + Upper class limit of the last class and divide by two

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13
Q

Mean and median are the left of the mode

A

Skewed to the left

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14
Q

Mean and median are the right of the mode

A

Skewed to the right

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15
Q

In any data if the mean is higher than the mode then

A

Skewed to the right

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16
Q

Difference between the maximum data value and the minimum data value

A

Range

17
Q

Range in frequency table

A

The upper boundary of the last class زائد نص - The lower boundary of the smallest class ناقص نص

18
Q

Measure of variations of values about the mean

A

The standard deviation

19
Q

The value if standard deviation is usually

A

Positive

20
Q

To find the standard deviation

A

نربع القيم ونطلع مجموع القيم ومجموع اللي ربعناه
نفتح جذر نضرب عدد القيم بمجموع اللي ربعناهم
ناقص مجموع القيم الاولى تربيع ونقسم على عدد القيم ضرب عدد القيم ناقص واحد

21
Q

Standard deviation in frequency table

A

١- اطلع الميد بوينتس
٢- اضرب الميد بوينتس بالفريكونسي واطلع مجموعهم
٣- اضرب الميد بوينتس بنفسها
٤- اللي ضربتهم بنفسهم اضربهم بالفريكونسي اقين واخذ مجموعهم
٥- اللي بحتاجه عدد الفركونسي ونقطة ٢،٤
٦- افتح جذر واضرب مجموع الفركونسي باخر نقطة واربع نقطة ٢ مقسومه على عدد الفركونسي ضرب ناقص واحد منهم

22
Q

What’s the range rule of thumb ?

A

( Range over 4 ) where range is max - min

23
Q

Empirical rule

A
  • 68% = 1 SD
  • 95% = 2 SD
  • 99.7% = 3 SD
24
Q

Coefficient of variation

A

variance over the mean multiply with 100 and then divide by two

25
Q

The number of standard deviation that a given value x is above or below the mean

A

Z score

26
Q

Whenever a value is less than the mean the z score is

A

Negative

27
Q

For the ……. the z score between-2 and 2

A

Ordinary data

28
Q

To find the z score corresponding:

A

Mean over the standard deviation

29
Q

Measures of location. Which divide a set of data into 100 groups with 1% of the values in each group

A

Percentiles

30
Q

To find the percentile corresponding :

A

Number of values less than x over the total number of values multiply with 100

31
Q

To find the 10th or whatever percentile :

A

1- اول شيء احط المطلوب قسمة ١٠٠ ضرب عدد القيم
2- اذا طلع لي عدد بالفواصل اعد من البدايه لو ٣ اعد ٣ ارقام واختار الرقم
3- لو طلع عدد كامل احسبه واخذ العدد اللي بعده واطلع ال midway بجمعهم وقسمة على ٢

32
Q

Measure of location, which divide a set of data into four groups with about 25% of the values in each group

A

Quartiles

33
Q

Q2 is the

A

Median

34
Q

Interquartile Range ;

A

Q3 - Q1

35
Q

Semi-interquartile Range :

A

Q3 -Q1 over 2

36
Q

Mid-quartile

A

Q3+Q1 over 2

37
Q

10-90 percentile range :

A

P90 - P10

38
Q

What’s the 5-number summary

A
  • Q1
  • Q2 median
    -Q3
    -

Biostatistics (6 decks)

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