26.5
_
Successful_Challenge
Men
Women
Unsuccess
ful_Challe
nge
439
217
TOTAL
656
ROW*COL/TOTAL
912
876
1788
Yes
Yes
No
No
TOTAL
1351
1093
2444
E = Expected P-value
362.62520458
293.37479542
988.374795
7.4
Ans12) (a) xx1 = 1387.3; s1 = 498.3; xx2 = 1039.3 and s2 = 346.7 (Verified using calculator)
(b) Let 1 be the population mean of x1 and 2 be the population mean of x2.
(xx1 - xx2) E < 1 - 2 < (xx1
9.1
Ans14) (a) This diagram illustrates the average number of employees in a group health insurance plan,
and the average administrative cost as a percentage of claims. The line slopes downward.
(b) F
10.1
Ans12) (a) = 0.05 (Given); Null hypothesis Ho: Ceremonial ranking and pottery type are
independent; Alternate hypothesis H1: Ceremonial ranking and pottery type are not
independent.
(b)
= 6.2
(c
8.1
Ans16) (a) If the average shopping time is less than 8.3 minutes, null hypothesis is H o : = 8.3
min and the alternative hypothesis as H1 : < 8.3 min. This is left tailed test. The P-value area
re
7.1
Ans16) x: a random variable that represents over production of uric acid in the body; = 1.85
mg/dl; xx = 5.38 mg/dl
(a) xx - E to xx + E: confidence interval; c= 0.95; zc = 1.96; n = 8; =
n
= 1.8
6.5
Ans12) (a) The mean of the first xx distribution is 5. (xx) = = 5.
The mean of the second xx distribution is 5. (xx) = = 5.
(b) The standard error of the first xx distribution is; (xx) = /
P (xx >
3.1
Ans12) (a) Mean = Sum of all values divided by the number of values. Mean = x /n = 23/5 = 4.6
In order to calculate the median, we arrange the set of numbers in increasing order: 2 2 3 6 10. As th
4.1
Ans12) (a) -0.41 cannot be the probability of some event because the minimum value for
probability of any event is 0.
(b) 1.21 cannot be the probability of some event because the maximum value for
1.1
Ans8) (a) Variable- Miles per gallon (mpg) for all new cars.
(b) The variable is quantitative.
(c) Implied population- All new cars.
Ans12) (a) Ordinal level- Salespersons performance.
(b) Ratio l