Advanced level school maths. hypothesis testing
need helps.

Question 8 (Normal + Known variance + Coding) 'Family' packs of cheese slices are sold in $1.5 kg$ packs. A sample of 40 packs was selected at random and the masses, $x$ , measured in $kg$ , are noted. The following results were obtained: $? (x ? 0.2) = 64.2 and ? (x ? 0.2)^{2} = 85.$ Assuming that the masses of the packs follow a normal distribution with variance $?^{2}$ , test, at a $1%$ significance level, whether the packs are overweight if $?^{2} = 0.1$

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Advanced level school maths. hypothesis testing
need helps.

Question 8 (Normal + Known variance + Coding) 'Family' packs of cheese slices are sold in

1.5 kg

packs. A sample of 40 packs was selected at random and the masses,

x

, measured in

kg

, are noted. The following results were obtained:

? (x ? 0.2) = 64.2 and ? (x ? 0.2)^{2} = 85.

Assuming that the masses of the packs follow a normal distribution with variance

?^{2}

, test, at a

1%

significance level, whether the packs are overweight if

?^{2} = 0.1

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