a manufacturer of electrical components makes resistors intended to have a resistance of 1000 ohms. The resistance, x ohms of each resistor is measured... summation x = 18980 , population mean is u ohms .. using 5% significance level, carry out 2 tail test ..null hypothesis u = 1000
Assume population standard deviation is 105 ohms, explain your reasons and state any assumptions, what test will you use ?
No number of resistors to find x bar?
oops.. a random sample of 20 resistors is taken
find x bar (18980/20 = 949)
find p value
find critical value
determine whether to reject using the rules in your notes
Any portion of the above steps unsure?
should t test or z test be used?
sample size less than 30 so should use t test?
oh ya, t test
assume population is normally distributed