Answer to Question #345172 in Statistics and Probability for PAAC2020C

Question

A restaurant located in an office building decides to adopt a new

strategy for attracting customers. Every week it advertises in the city newspaper. In the 6

weeks immediately prior to the advertising campaign, the weekly grosses were 350, 320,

307, 398, 420, 335 (in million VND). In the eight weeks after the campaign began, the

weekly grosses was 488, 301, 276 380, 421, 425 (in million VND).

a/ Test with  = 0.05 to determine whether there is enough evidence to conclude that

expected weekly gross after the advertising campaign differs from 382.

b/ Given that the weekly grosses are normally distributed, can we conclude that the

advertising campaign helped in improving weekly grosses? (Assuming unequal variances

and using  = 0.05)

Answer 1

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