Roastie's Coffee

[Prince.obx_14]

Roastie’s Coffee is sold in packets with a stated weight of 250 g. A supermarket manager
claims that the mean weight of the packets is less than the stated weight. She weighs a random
sample of 90 packets from their stock and finds that their weights have a mean of 248 g and a
standard deviation of 5.4 g.
(a) Using a 5% level of significance, test whether or not the manager’s claim is justified. State
your hypotheses clearly.

#I need help with Qs (a) Please!!!!#

 

[Dr.Peterson]

Roastie’s Coffee is sold in packets with a stated weight of 250 g. A supermarket manager
claims that the mean weight of the packets is less than the stated weight. She weighs a random
sample of 90 packets from their stock and finds that their weights have a mean of 248 g and a
standard deviation of 5.4 g.
(a) Using a 5% level of significance, test whether or not the manager’s claim is justified. State
your hypotheses clearly.

#I need help with Qs (a) Please!!!!#

Please show us how far you can get, and why you are stuck where you are. Can you state the hypotheses? Can you see what kind of test is appropriate? Can you tell us what you have learned recently that might be relevant? All this will help us know what sort of help you need in order to learn from this exercise what you are expected to learn:

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