# Stats- Assignment 1 (Natasha Shand)

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(22 total marks) 1. Observations from the first 25 days of the year showed that the following number of pedestrians used a p;\icu r crosswalk on gach day; 8 LU AP A marks) 5w 6455 o o S HA f o 125~ a. Construct a frequency distribution for this data using a lower limit for the first class of 15 and a class width of 20. Indicate the class limits, boundaries, midpoints, frequencies and cumulative frequencies. Class boundries|" 9P ]2 [ Sreopiency [Forytimmay |- fusirch 22 |cequtncy n e loweyr timit upper limit 15 35 25 Y q 006 | o 35 55 4s 2 o 0.08 | 24 55 15 LD T '3 0.28 bY2 s a5 85 o 19 o.24 | 70 a5 ns 105 Y 23 ote | gz 1ns 1395 125 2 25 0.08 )00 suo1asypad 50 XQquAU class Wid+th=20 J.upper Vimi¥= 15420=35 Relative -ﬂequmc,x_., (4 marks) o__ & S 5 & & cumulotive -Fvequenmi: frequency of class 4 previous class 'Frcqu ) First cumulakive frequency o previous cass IS Q b. C_reat_e a relative frequency polygon of the number of pedestrians. velative -F(e%uenc\' = class Frequency /25 l\auan*oa% MLY0\RY
(4 marks) b. Create a relative frequency polygon of the number of pedestrians. cumulative relative "'\"ﬂr'"'"af (4 marks) c. Create a percentage ogive of the number of pedestrians. O 10 20 30 40 so 60 70 80 %0 100 g 5 3 SN £ genw z N a g \ 3 o ¢ i % mn _ < g—: y o . + T3 3 (=] 2 H 2 - N
8:34 AM Thu May 4 (3 marks) d. Calculate the approximate value of the 30th percentile. What does this number tell you? W cevuentile = 30 x2S T 7.8 o0 e 100 2 8™ valwe oF § m'mn%ed n ascending order,wWhich is s?q s 5a is +he 30" percentile wwick Fells 307 of ¥hne wwole dota lies below 59, (3 marks) e. Circle True (T) or False (F) for each of the following statements with reference to the original dataset information given in this question. @ F The number 132 represents an element. T @ The information provided represents the use of cross-section data. T @ The number of pedestrians is a continuous variable. (4 marks) 2. Indicate whether each of the following examples describes the use of descriptive (D) or inferential (I) statistics by clearly circling D or I. D I In my son's grade-three classroom, 25% of the kids are under the age of eight and 75% are eight or older. D I A comparison between placebo and drug treatments has determined that drug X produces approximately a 5% reduction in the severity of symptoms of Alzheimer's patients. D I LS B E ) R SN CU N AR -
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