Daily Practice · Foundation
February 2013 5-a-day
Printing for a group?
The batch download puts all 2 tiers' February 2013 sheets in a single PDF, each tier behind its own divider page - 56 sheets in one file.
Every sheet in February 2013
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 2013A sample of 80 light bulbs from a batch of 2000 found 4 were faulty. Estimate the number of faulty bulbs in the whole batch.
- 2nd February 2013The mean of 6 numbers is 15. Five of the numbers are 10, 12, 14, 18, 20. Find the sixth number.
- 3rd February 2013State one advantage of random sampling.
- 4th February 2013What is meant by a control variable?
- 5th February 2013Values of 12, 18, 25, 31, 9, 22, 15 are grouped using intervals 0 <= x < 10, 10 <= x < 20, 20 <= x < 30, 30 <= x < 40. State the frequency of the interval 10 <= x < 20.
- 6th February 2013A pie chart shows four categories with angles 90, 120, 60 and x degrees. Find x.
- 7th February 2013Events A and B are mutually exclusive with P(A) = 0.3 and P(B) = 0.25. Find P(A or B).
- 8th February 2013Explain why estimating a y-value for x = 50 would be unreliable if all the plotted data only covers x-values from 0 to 20.
- 9th February 2013Two variables have a correlation coefficient close to 0. What does this suggest?
- 10th February 2013The Spearman's rank correlation coefficient between temperature and ice cream sales for 8 days is rs = 0.95. Describe the correlation.
- 11th February 2013A pilot survey shows that many respondents left a question blank. What might this suggest about the question?
- 12th February 2013A researcher records the exact temperature of 30 cups of tea to the nearest 0.1 degrees C. State the type of data, giving two features.
- 13th February 2013Group A has 4 items with mean 12. Group B has 4 items with mean 20. Find the combined mean.
- 14th February 2013The number of pets owned by 15 households, recorded as collected, is: 0,1,2,1,0,3,1,2,0,1,1,2,0,1,2. Complete a frequency table for the number of pets and state the total frequency.
- 15th February 2013A bar chart shows 3 bars: Dogs 12, Cats 9, Rabbits 5. How many pets are shown in total?
- 16th February 2013Using the same diagram (0|5 8, 1|2 2 6, 2|1), what is the range?
- 17th February 2013A cumulative frequency graph shows that a cumulative frequency of 45 corresponds to a value of 60 on the horizontal axis, out of 90 total data values. How many data values are above 60?
- 18th February 2013What is the purpose of the key on a choropleth map?
- 19th February 2013A data set of 50 exam scores has the 20th percentile at 42 marks and the 80th percentile at 78 marks. Explain what these two values tell you about the middle 60% of scores.
- 20th February 2013Which spreadsheet formula would you use to find the total of the values in cells B2 to B20?
- 21st February 2013A supermarket wants to know if a new till layout reduces queuing time. Write a suitable statistical question for the start of the enquiry cycle.
- 22nd February 2013Give one disadvantage of an observation study.
- 23rd February 2013Two classes have the same median test score. Class A has IQR = 6 and Class B has IQR = 15. Which class's scores are more consistent, and why?
- 24th February 2013A pictogram has a key of 1 symbol = 4 people. A town has 22 people who play chess. How many symbols, including any part-symbol, should be drawn?
- 25th February 2013Using two fair six-sided dice added together, how many ways can you score a total of 7?
- 26th February 2013Find the midpoint of the class interval 10-20.
- 27th February 2013A company's yearly profits are 10, 12, 11, 15, 14 thousand pounds over five years. Describe the general trend.
- 28th February 2013Out of 200 people who ate a certain meal, 10 became ill. What is the risk of becoming ill, as a fraction in its simplest form?