Daily Practice · Foundation
October 2018 5-a-day
Printing for a group?
The batch download puts all 2 tiers' October 2018 sheets in a single PDF, each tier behind its own divider page - 62 sheets in one file.
Every sheet in October 2018
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 2018A quality inspector samples 120 items from a batch of 15000 and finds 3 defective, but the sample was taken only from items made in the last hour of the day. Explain why her estimate might not be reliable, and give the estimate assuming the sample were representative.
- 2nd October 2018Find the mode of 5, 6, 5, 8, 6, 6, 9.
- 3rd October 2018State one disadvantage of quota sampling.
- 4th October 2018Give one reason why participants should be assigned to groups at random.
- 5th October 2018A class interval is written 10 <= x < 20. Which of these values belong in it: 10, 20, 15?
- 6th October 2018A pie chart represents 60 people. What angle represents 1 person?
- 7th October 2018A rectangle labelled 20 contains two non-overlapping circles for events A and B with 8 and 5 inside them. How many outcomes are outside both circles?
- 8th October 2018Using the line of best fit from the previous question, estimate the y-value when x = 6.
- 9th October 2018Define correlation in your own words.
- 10th October 2018The Spearman's rank correlation coefficient between the age of a used car and its price is rs = -0.88. Describe the correlation.
- 11th October 2018State one change a researcher might make to a questionnaire as a result of a pilot survey.
- 12th October 2018State whether 'shoe size' is discrete or continuous, and explain why.
- 13th October 2018Group A has 18 items with mean 62. Group B has 22 items with mean 70. Find the combined mean.
- 14th October 2018A tally shows 4 full groups of five plus 2 extra marks for one category. What is the frequency?
- 15th October 2018A composite bar chart shows exam grades at a school: the bar has a section from 0 to 10 for Grade 9-7, a section from 10 to 34 for Grade 6-4, and a section from 34 to 40 for Grade 3-1. How many students got Grade 6-4?
- 16th October 2018Using the diagram from the question above, what is the mode?
- 17th October 2018A cumulative frequency graph for 80 data values is used to estimate the median. At what cumulative frequency value do you read across to the curve?
- 18th October 2018A choropleth map uses class intervals of 0-10, 10-30, 30-40 and 40-90. Why might this be misleading?
- 19th October 2018What percentage of data lies below the 40th percentile?
- 20th October 2018Which spreadsheet formula would you use to find how many values are in the range C1 to C50?
- 21st October 2018A researcher decides her sample size was too small after seeing her results. Which stage of the cycle does this belong to?
- 22nd October 2018A question asks: 'Don't you agree that the new bus timetable is an improvement?' State what is wrong with this question.
- 23rd October 2018For the ordered data 2, 4, 5, 7, 8, 9, 11, 13, 14, find the lower quartile (Q1) and upper quartile (Q3).
- 24th October 2018A pictogram shows 5 full symbols for apples sold, with a key of 1 symbol = 12 apples. How many apples were sold?
- 25th October 2018Using the two-coin sample space, find P(exactly one head).
- 26th October 2018A frequency polygon has classes of unequal width: 0-10 and 10-30. Explain why comparing the heights of the two plotted points directly can be misleading.
- 27th October 2018Explain why using a time series trend to estimate a value many years into the future is less reliable than estimating one year ahead.
- 28th October 2018Using your answers to the previous question, find the relative risk for phone users compared with non-users, and interpret it.
- 29th October 2018A pack of 10 cards is numbered 1 to 10. One card is drawn and not replaced; it is even. A second card is then drawn. Find P(second card is even given the first card was even).
- 30th October 2018A pie chart is drawn showing 3 sectors that look visually equal in size, but the data is 50%, 30% and 20%. What is wrong?
- 31st October 2018A class interval 0-10 has frequency 6. Find frequency x midpoint.