Random 20 petrol prices per liter , x , from 2018 to early 2022 had results: assuming

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Random 20 petrol prices per liter , x , from 2018 to early 2022 had results:

$( Sigma x=39.57 ) and ( sum x^{2}=79.02 )$

assuming the price is normally distributed,
i. calculate unbiased estimators for population mean and variance (up to 2 dec places).
ii. between 2014-2017, the average price was $1.9 per liter. Does this mean that from 2018-2022, the price increased from 2013? Test at 10% significance level.

Posted Date: Oct 25, 2021 04:26 AM

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Random 20 petrol prices per liter , x , from 2018 to early 2022 had results: assuming

Question:

Σx = 39.57 and Ex" = 79.02 Σx = 39.57 and Ex" = 79.02

Expert Answer:

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