4) A manufacturer claims that the mean lifetime of its lithium batteries is 1500 hours. A homeownerselects 30 of these batteries and finds the mean lifetime to be 1470 hours with a standard deviation...

4) A manufacturer claims that the mean lifetime of its lithium batteries is
1500 hours. A homeownerselects 30 of these batteries and finds the mean
lifetime to be 1470 hours with a standard deviation of 80 hours. Test the
manufacturer's claim. Use=0.05 . Round the test statistic to the nearest
thousandth

a) Hypothesis :

b) Critical value (tcritical) :

c) Test statistic (tstat) and the decision about the test statistic: (reject or fail to reject
Ho) :

d) Conclusion that results from the decision about Ho, how would you politely address the manufacturer’s claim?