rorosingsong
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- Nov 3, 2011
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Hi, I'm studying for finals atm, and I'm having difficulties with this old exam question. I would really appreciate some help here, I can't ever seem to figure out which test to use.
E. Canis is a tick borne disease of dogs which is sometimes contracted by humans. According to Vital Health Statistics (1982) the mean white blood cell count in the general human population is 72.5 (in '000/mm^3). It is believed that infection by E. Canis lowers the average white blood cell count. To investigate this, the white blood cell counts (x) of a sample of 20 infected humans was obtained:
39, 54, 50, 53, 74, 77, 78, 51, 69, 58, 87, 60, 67, 65, 70, 87, 57, 45, 61, 71.
Set up appropriate null and alternative hypotheses, and perform a test of significance which assumes normality.
I've already calculated the sample mean (63.65) and sample standard deviation (13.22), but have no idea where to go from there. Please help!
Thanks in advance!
Roro
E. Canis is a tick borne disease of dogs which is sometimes contracted by humans. According to Vital Health Statistics (1982) the mean white blood cell count in the general human population is 72.5 (in '000/mm^3). It is believed that infection by E. Canis lowers the average white blood cell count. To investigate this, the white blood cell counts (x) of a sample of 20 infected humans was obtained:
39, 54, 50, 53, 74, 77, 78, 51, 69, 58, 87, 60, 67, 65, 70, 87, 57, 45, 61, 71.
Set up appropriate null and alternative hypotheses, and perform a test of significance which assumes normality.
I've already calculated the sample mean (63.65) and sample standard deviation (13.22), but have no idea where to go from there. Please help!
Thanks in advance!
Roro