13.A random sample of people in a community was selected and asked if they are in favour of building a nuclear power plant. The researcher wishes to see if opinion and gender are independent. The observed frequencies are recorded in the following table

	Male	Female
In favour	14	10
Against	15	6
No opinion	13	17

Calculate the expected cell frequency for males in favour. Give your answer correct to two decimal places.

12 Student exam marks (out of 100) and the number of classes they missed in the trimester were recorded for a subject. Excel was used to investigate the potential linear relationship between these two variables. A section of the summary output is provided below:

Regression statistics

Multiple R	0.49
R square	0.24
Observations	84
	Coefficients	Standard Error
Intercept	93.04	8.75
Classes missed	-7.84	3.67

What is the correlation coefficient?

Give your answer correct to two decimal places. Do NOT include units. Do NOT give a percentage

11.The management team of a large store is interested in the relationship between annual sales ($000) and the opening times (hours) of different franchise stores. The following regression output summarises the findings for a sample of franchise stores.

Regression Statistics
Multiple R	0.81
R square	0.6561
Adjusted R square	0.623295
Observations	96

	Coefficients
Intercept	365.9
Opening times	4

How many observations were used to create this regression?