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13. A recent report claims that the monthly sales of a Giant store is less than...

13. A recent report claims that the monthly sales of a Giant store is less than $2 million due to Corona. A random sample of 35 stores shows that the sample mean is $1.80 million and the standard deviation is $0.68 million. Prove the claim using p-value method at alpha = 0.10.

Math   Statistics-And-Probability   
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Answer #1

this is the left tailed test .  

The null and alternative hypothesis is ,

H0 :   = 2

Ha : < 2

Test statistic = z

= ( - ) / / n

= (1.80-2) / 0.68/ 35

z= -1.74

P(z < -1.74) = 0.0409

P-value = 0.0409

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