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4 Statistics Questions/Problems

Sent to General Experts July 16, 2004 1:22 p.m.

For Exercises 5: (a) State the null hypothesis and the alternate hypothesis. (b) State the decision
rule. (c) Compute the value of the test statistic. (d) What is your decision regarding H0?
(e) What is the p-value? Interpret it.
5. The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire
can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is
5,000 miles. The Crosset Truck Company bought 48 tires and found that the mean mileage for
their trucks is 59,500 miles. Is Crossetâ€™s experience different from that claimed by the manufacturer
at the .05 significance level?

Customer (name blocked for privacy)

Status: Closed Value: $20

Answer
July 16, 2004 4:17 p.m. (2 hours and 55 minutes later)

ACCEPTED

A)
the null hypothesis is
lets say X is the number of miles driven
Ho:X<=60.000
H1=X>60.000

b)
in order to solve it we know X= 59.500
n=48
sd. deviation=5000
we do not know the distribution of th life tires so that we will use CLT
we use CLM if we do not know the distrubtion
it is
X-ì
-----
ó/n

c)
we can calculate the t statistics
59500-60.000
-------------
5000/sqroot of 48
=-0.69

d)
the t statistics is in BSOLUTE VALUE LESS THAN 1.645
so that we fail to reject Ho
e)
p value is
from the table we will look at the
table
for -0.69
the p value is % 76

if you have further questions do not hesitate to ask to me we can make a deal
my e mail is
farukballi@hotmail.com
thanks

__________________
Faruk

skywalker -- PhD -- 67% Positive Feedback on 3 General Accepts
8 YEAR EXPERENCED TUTOR GRADUATED FROM TOP SCHOOLS

Reply
Sent July 17, 2004 11:51 a.m. (19 hours and 33 minutes later)

I sent four three other problems... I did not receive that were attached to the original message.. Please advise.. Thank you...

Customer (name blocked for privacy)

Answer
July 18, 2004 5:05 a.m. (17 hours and 14 minutes later)

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skywalker -- PhD -- 67% Positive Feedback on 3 General Accepts
8 YEAR EXPERENCED TUTOR GRADUATED FROM TOP SCHOOLS

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