2. In order to investigate the relationship between mean job tenure in years among workers who have a bachelor's degree or higher and those who do not, random samples of each type of worker were taken, with the following results. Construct a 99% confidence interval for the difference in the population means based on the below data. Bachelor's degree or higher 155 5.2 1.3 No degree 210 5.0 1.5
2. In order to investigate the relationship between mean job tenure in years among workers who have a bachelor's degree or higher and those who do not, random samples of each type of worker were taken, with the following results. Construct a 99% confidence interval for the difference in the population means based on the below data. Bachelor's degree or higher 155 5.2 1.3 No degree 210 5.0 1.5
Chapter9: Sequences, Probability And Counting Theory
Section9.5: Counting Principles
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2. In order to investigate the relationship between mean job tenure in years among workers who
have a bachelor's degree or higher and those who do not, random samples of each type of worker
were taken, with the following results. Construct a 99% confidence interval for the difference in the
population means based on the below data.
Bachelor's degree or higher 155 5.2 1.3
No degree 210 5.0 1.5
3. Records of 40 used passenger cars and 40 used pickup trucks (none used commercially) were
randomly selected to investigate whether there was any difference in the mean time in years that
they were kept by the original owner before being sold. For cars the mean was 5.3 years with a
population standard deviation, o, 2.2 years. For pickup trucks the mean was 7.1 years with
population standard deviation, o, 3.0 years. Construct the 95% confidence interval for the difference
in the means based on these data.
M
SUS
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