d) Use the regression equation and calculate the predicted number of sales when a dishwasher tablets cost £6.00.

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Chapter1: Starting With Matlab
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please send handwritten solution for part d
6. The price of a branded dishwasher tablets varies through the year depending on
promotions etc. A supermarket is interested in the effect of the price change on the
number of sales. They collated a small sample of daily sales data from the last 12
months and the results are displayed in the graph below.
Daily Sales Dishwasher Tablets vs Price
y = -8.46x + 108
R2 = 0.69
80
70
60
50
40
30
20
10
£0.00
£2.00
£4.00
£6.00
£8.00
£10.00
£12.00
Price
a) Perform a visual assessment of the scatterplot and describe the data points
and data pattern.
b) Use the regression equation given above at the right corner of the graph and
state the value for intercept (the constant).
c) Use the regression equation given above at the right corner of the graph and
state the value for slope (the gradient).
d) Use the regression equation and calculate the predicted number of sales
when a dishwasher tablets cost £6.00.
e) State and interpret the r2 value in the context of this scenario.
f) Calculate and interpret the r value in the context of this scenario.
Sales
Transcribed Image Text:6. The price of a branded dishwasher tablets varies through the year depending on promotions etc. A supermarket is interested in the effect of the price change on the number of sales. They collated a small sample of daily sales data from the last 12 months and the results are displayed in the graph below. Daily Sales Dishwasher Tablets vs Price y = -8.46x + 108 R2 = 0.69 80 70 60 50 40 30 20 10 £0.00 £2.00 £4.00 £6.00 £8.00 £10.00 £12.00 Price a) Perform a visual assessment of the scatterplot and describe the data points and data pattern. b) Use the regression equation given above at the right corner of the graph and state the value for intercept (the constant). c) Use the regression equation given above at the right corner of the graph and state the value for slope (the gradient). d) Use the regression equation and calculate the predicted number of sales when a dishwasher tablets cost £6.00. e) State and interpret the r2 value in the context of this scenario. f) Calculate and interpret the r value in the context of this scenario. Sales
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