STAT170 Workshop Notes prepared by Nan Carter for Numeracy ...

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etween 5 and 20 hours. A recent survey of 450 students showed that 117 students watched TV for less than 5 hours per week, 267 watched between 5 and 20 hours, and the remainder watched 20 or more hours per week. Has the pattern of watching TV changed for students in the five years? If there has been a significant change, describe where it has occurred. CHECKS: Q4: z = -11.14, p
sandwich, only 4 became ill. We would like to test whether there is an association between the consumption of a sandwich and the onset of gastroenteritis. Question 9. In a sample of 110 working women in Sydney, all aged between 30 and 50 years, the following table shows the data classified by ‘highest level of education attained’ [coded 1: did not complete secondary school; 2: graduated from secondary school; 3: attended TAFE college or other institution; 4: bachelor degree from university; 5: higher degree from university] and by ‘number of children’. Number of Children Education 39 0 1 2 3 4 5,6 Nan Carter: workshop notes prepared for Numeracy Centre Macquarie University. All 1 4 2 2 9 3 0 20 2 1 4 7 11 4 2 29 3 0 3 11 7 2 0 23 4 1 6 12 10 0 0 29 5 2 3 3 1 0 0 9 All 8 18 35 38 9 2 110 a) Are all the expected frequencies at least 5? b) If not, collapse the table until this criterion is met. Note: to identify the smallest expected frequency, multiply smallest row total by smallest column total; if
Page 1 and 2: STAT170 Workshop Notes prepared by
Page 3 and 4: Week 4 H/Y. Exercises for STAT170 w
Page 5 and 6: Week 5 H/Y. Questions on SAMPLING D
Page 7 and 8: EXAMPLES ON WORKING WITH PROPORTION
Page 9 and 10: EXERCISE 4. Suppose we wanted to pl
Page 11 and 12: We now have a single sample of diff
Page 13 and 14: Week 8 H/Y. STAT170 workshop on the
Page 15 and 16: Week 9 H/Y. Stat170 workshop on Hyp
Page 17 and 18: EXERCISE 11: In Q5 use a hypothesis
Page 19 and 20: PAIRED t-TEST: QUESTION 1. (from St
Page 21 and 22: QUESTION 4. “You can taste the lu
Page 23 and 24: sp =√[{(n1-1)s1 2 + (n2-1)s2 2 }
Page 25 and 26: a) Draw the scatterplot of the data
Page 27 and 28: Residual 20 15 10 5 0 -5 -10 -15 -2
Page 29 and 30: Residual Residual 1 0.8 0.6 0.4 0.2
Page 31 and 32: Relation: Monthly sales volume outc
Page 33 and 34: Unstandardized Residual 33 40 20 0
Page 35 and 36: mid-year exam paper (See below: the
Page 37: if the hypothesis is true. FOR EXAM
Page 41 and 42: Notice that a) 3.89 = 1/0.26, so if

STAT170 Workshop Notes prepared by Nan Carter for Numeracy ...

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