Dullco Manufacturing claims that its alkaline batteries last at least 40 hours on average in a certain type of portable CD player. But tests on a random sample of 18 batteries from a day's large production run showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. To test DullCo's hypothesis, the p-value is

The value is  

Step-by-step explanation:

From the question we are told that

  The  population mean is

  The  sample size is  

    The  sample mean is  

   The standard deviation is  

The null hypothesis is  

The alternative hypothesis is  

Generally the test statistic is mathematically evaluated as

From the z - table the p-value is obtained and the value is  

step-by-step explanation:

i need the options

step-by-step explanation: