Try the following self-assessment questions. When you have decided on your answer,mouse over the answer button to check:

 

1. Which of the following describe data in the form of frequencies?

  • The number of pregnant women falling into the following categories: non-smoker, light smoker, heavy smoker. The answer is yes
  • The percentage of pregnant women falling into the following categories: non-smoker, light smoker, heavy smoker. The answer is no
  • The mean number of cigarettes smoked per day by 20 pregnant women. The answer is no
  • The hair colour (measured as red, brown, black or blonde) of 100 people from Great Britain. The answer is no
  • The number of leaves on 20 geranium plants grown for three weeks in sunlight. The answer is no
  • The number of geranium plants grown in sunlight for three weeks with between 0-10 leaves, 11-20 leaves, or ≥21 leaves. The answer is yes

 

2. For each of the following features, say whether it applies to a one-way Chi square test:

  • Parametric test. The answer is no
  • Nonparametric test. The answer is yes
  • Numbers plugged into the formula for the statistic are frequencies. The answer is yes
  • Numbers plugged into the formula for the statistic are percentages. The answer is no
  • Numbers plugged into the formula for the statistic are means and standard deviations. The answer is no
  • Compares an observed frequency distribution with one based on a specified theoretical distribution. The answer is yes
  • Should not be used if one or more expected values are zero. The answer is yes
  • Should be used with caution if more than one-fifth of the expected values are less than 5. The answer is yes
  • Should not be used when an item contributes to more than one cell in the frequency table. The answer is yes
  • Used on unrelated data. The answer is yes
  • Used for related data. The answer is no
  • Uses a statistic called the 'Pearson Chi-square'. The answer is yes
  • Uses a statistic called the 'likelihood Chi-square'. The answer is no
  • reject the null hypothesis if the X2 value calculated is less than the critical value of X2 looked up in a table. The answer is no