If u subtract 12 from a number and multiply the result by 12 you get 18. what is the number
2 answers:
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<h2>Answer with explanation:</h2>
Let be the population mean.
For the given claim , we have
Null hypothesis :
Alternative hypothesis :
Since alternative hypothesis is two-tailed , so the test is a two-tailed test.
Given : Sample size : n=220 ;
Sample mean: ;
Standard deviation:
Test statistic for population mean:
By using the standard normal distribution table of z , we have
P-value ( two tailed test ) :
Since , the P-value is greater than the significance level of , it means we do not have sufficient evidence to reject the null hypothesis.