2. Let sample proportion . How large a sample should be taken to be 95 % sure that the error of estimation does not excecd 0.02 when estimating a proportion?
2. Let sample proportion . How large a sample should be taken to be 95 % sure that the error of estimation does not excecd 0.02 when estimating a proportion?
Question
Transcribed Image Text:2. Let sample proportion . How large a sample should be taken to be 95 % sure that the
error of estimation does not exceed 0.02 when estimating a proportion?
3. A business consultant wanted to investigate if providing day care facilities on premises
by companies reduces the absentee rate of working mothers from companies that provide
day care facilities on premises. Sample of 50 mothers selected from the companies that
provide day care facilities was taken. These mothers missed an average of 6.4 days from
work last year with a standard deviation of 1.20 days. Another sample of 50 such mothers
taken from companies that do not provide day care facilities on premises showed that these
mothers missed an average of 9.3 days last year with a standard deviation of 1.83 days.
Construct a 98 % confidence interval for the difference between the two population means.
4. Assume that 66 % of single women and 81.9 % of single men own cars. Also assume
that these estimates are based on random samples of 1640 single women and 1800 single
men. Develop a 99 % confidenee interval for the difference between the two population
proportions.
Page 1 I 1
Q
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 1 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.