Week4 : Assignment 4
If we have a sample size of 20 and population standard deviation is known, we will use:
1 point
Null hypothesis, Ho: mu1- mu2 = 0 is a:
1 point
The quality-control manager at a Li-BATTERY factory needs to determine whether the mean life of a large shipment of Li-Battery is equal to the specified value of 375 hours. The process standard deviation is known to be 100 hours. A random sample of 64 batteries indicates a sample mean life of 350 hours.
State the null and alternative hypotheses
1 point
The quality-control manager at a Li-BATTERY factory needs to determine whether the mean life of a large shipment of Li-Battery is equal to the specified value of 375 hours. The process standard deviation is known to be 100 hours. A random sample of 64 batteries indicates a sample mean life of 350 hours.
At the alpha = 0.05 level of significance is there any evidence that the mean life is different from 375 hours?
1 point
For one-tailed test, the test statistic z is determined to be zero. The p-value for this test is:
1 point
The error of rejecting a true null hypothesis is:
1 point
The mean cost of a hotel room in a city is said to be $168 per night. A random sample of 25 hotels resulted in X-bar = $172.50 and sample standard deviation s = 15.40. Calculate the t statistic.
1 point
In hypothesis testing if the null hypothesis is rejected,
1 point
In the hypothesis testing procedure, alpha is
1 point
If a hypothesis is rejected at the 5% level of significance, it
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