An environmental researcher believes that there is a positive correlation between the average daily temperature in a city and the concentration of ground-level ozone.
The researcher collected data from a random sample of 40 days.
The product moment correlation coefficient (PMCC) between the temperature and ozone concentration for this sample was 0.38.
Carry out a hypothesis test at the 1% significance level to determine if this sample provides sufficient evidence to support the researcher's belief.
For n=40n = 40n=40, the critical value for a one-tailed test at the 1% level for the population correlation coefficient is 0.3665.
316 exam-style questions on OCR A Level Maths 2.5 Statistical Hypothesis Testing, covering 2.5.1 The language of hypothesis testing, 2.5.2 Hypothesis test for a binomial proportion, 2.5.3 Inference and significance level, 2.5.4 Sample mean as a random variable (A-level only), 2.5.5 Hypothesis test for the mean of a normal distribution (A-level only), 2.5.6 Pearson's product-moment correlation coefficient, and 2.5.7 Hypothesis test using Pearson's coefficient (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.