Quiz: Section 8.1 Quiz 1 pt The probability that a randomly selected time interv

Question

Quiz: Section 8.1 Quiz 1 pt The probability that a randomly selected time interval is longer than 109 minutes is approximatey Round to four decimal places as needed) (b) What is the probability that a random sample of 10 time intervals between enuptions has a mean longer than 109 minutes? The probablity that the mean of a random sample of 10time rtrok is moten ,09 min isappoi ately[ Round to four decimal places as needed) (e) What is the probability that a random sample of 28 time interals behwen enuptions has a mean longer than 109 minutes? The probablity that the mean of a dom sample of 28trne rtenais moretan 109 mites-appro inat-y[ (Round to four decimal places as needed) (d) What effect does increasing the sample size have on the probablity?Provide an explanation for this resuit Fain Ir the population the blanks below mean is les than 109 minutes, then the probability that the sample mean of the time betwen nuptions is greater than 100 minude between enuptions has a mean longer than 109 minules? Select llthat apply The population mean may be less than 06. B. The population mean must be less than 95, since the probability is so low r C. The population mean may be peater than 96. D. The population mean carrot be 95. srce te prtab, s se lo mean is 95, and this is just a rare sampling E. F. o. The The population mean must be more than 96, snce the pot-isao The population mean is 95, and this is an example of atypicai "pingresut 9 5 6

Explanation / Answer

a)

b)

c)

d)

blanks are : decreases /decreases /increases

e)

option C and E are correct

for normal distribution z score =(X-)/ here mean=       = 95.000 std deviation   == 35

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