Daily Practice · Foundation
July 2019 5-a-day
Printing for a group?
The batch download puts all 2 tiers' July 2019 sheets in a single PDF, each tier behind its own divider page - 62 sheets in one file.
Every sheet in July 2019
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st July 2019A researcher wants a stratified sample of 30 from a population of 300 split into three regions: North (90 people), South (150 people) and East (60 people). She actually samples 9 from the North, 14 from the South and 7 from the East. Show whether her sample is correctly stratified, stating the correct numbers if not.
- 2nd July 2019Using the same table (0:4, 1:10, 2:4, 3:2), find the median number of siblings.
- 3rd July 2019Data set X has a range of 12 and data set Y has a range of 5. Which data set is more consistent?
- 4th July 2019An index number is 140 with a base value of 20. Find this year's value.
- 5th July 2019A bag has 4 yellow and 6 white balls. What is P(picking a yellow ball)?
- 6th July 2019A dice is rolled 120 times and shows a 6 on 15 of those rolls. Find the relative frequency of rolling a 6.
- 7th July 2019A bag has 4 green and 6 yellow balls. One ball is drawn, replaced, then a second is drawn. Find P(both yellow).
- 8th July 2019A pyramid has a wide base and a narrow top. What does this suggest about the population?
- 9th July 2019A distribution has a long tail of high values on the right. What type of skew is this?
- 10th July 2019A 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.
- 11th July 2019Find the mode of 5, 6, 5, 8, 6, 6, 9.
- 12th July 2019State one disadvantage of quota sampling.
- 13th July 2019Give one reason why participants should be assigned to groups at random.
- 14th July 2019A class interval is written 10 <= x < 20. Which of these values belong in it: 10, 20, 15?
- 15th July 2019A pie chart represents 60 people. What angle represents 1 person?
- 16th July 2019A 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?
- 17th July 2019Using the line of best fit from the previous question, estimate the y-value when x = 6.
- 18th July 2019Define correlation in your own words.
- 19th July 2019The Spearman's rank correlation coefficient between the age of a used car and its price is rs = -0.88. Describe the correlation.
- 20th July 2019State one change a researcher might make to a questionnaire as a result of a pilot survey.
- 21st July 2019State whether 'shoe size' is discrete or continuous, and explain why.
- 22nd July 2019Group A has 18 items with mean 62. Group B has 22 items with mean 70. Find the combined mean.
- 23rd July 2019A tally shows 4 full groups of five plus 2 extra marks for one category. What is the frequency?
- 24th July 2019A 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?
- 25th July 2019Using the diagram from the question above, what is the mode?
- 26th July 2019A 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?
- 27th July 2019A choropleth map uses class intervals of 0-10, 10-30, 30-40 and 40-90. Why might this be misleading?
- 28th July 2019What percentage of data lies below the 40th percentile?
- 29th July 2019Which spreadsheet formula would you use to find how many values are in the range C1 to C50?
- 30th July 2019A researcher decides her sample size was too small after seeing her results. Which stage of the cycle does this belong to?
- 31st July 2019A question asks: 'Don't you agree that the new bus timetable is an improvement?' State what is wrong with this question.