Solve the problem.
A bank\'s loan officer rates applicants for credit. The ratings are normally distributed with a
mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the
percentage of applicants with a rating that is between 170 and 220.
?A.
7.03%
?B.
38.11%
?C.
22.57%
?D.
15.54%
Solution
P(170.
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Solve the problem. A confidence interval estimate of the ratio .pdf
1. Solve the problem.
A confidence interval estimate of the ratio / can be found using the following expression:
< < ,
where FR is found in the standard way and FL is found as follows: interchange the degrees of
freedom, and then take the reciprocal of the resulting F value found in table A-5.
A manager at a bank is interested in the standard deviation of the waiting times when a single
waiting line is used and when individual lines are used. Obtain a 95% confidence interval for /
given the following sample data:
Sample 1: multiple waiting lines: n1 = 13, s1 = 2.1 minutes
Sample 2: single waiting line: n2 = 16, s2 = 0.8 minutes
a. 2.33 < / < 20.4
b. 2.38 < / < 17.43
c. 2.33 < / < 21.91
d. 2.78 < / < 18.05
Solution
c. 2.33 < / < 21.91