Question

The average expenditure on Valentine's Day was expected to be
$100.89 (*USA Today*, February 13, 2006). Do male and female
consumers differ in the amounts they spend? The average expenditure
in a sample survey of 50 male consumers was $135.13 and the average
expenditure in a sample survey of 39 female consumers was $65.59.
Based on past surveys, the standard deviation for male consumers is
assumed to be $31 , and the standard deviation for female consumers
is assumed to be $20. The value is 2.576.

a. What is the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females?

b. At 99% confidence, what is the margin of error?

c. Develop a 99% confidence interval for the difference between the two population means. ___________ to _________

Answer #1

The average expenditure on Valentine's Day was expected to be
$100.89 (USA Today, February 13, 2006). Do male and female
consumers differ in the amounts they spend? The average expenditure
in a sample survey of 50 male consumers was $135.13 and the average
expenditure in a sample survey of 39 female consumers was $65.59.
Based on past surveys, the standard deviation for male consumers is
assumed to be $31 , and the standard deviation for female consumers
is assumed to...

The average expenditure on Valentine's Day was expected to be
$100.89 (USA Today, February 13, 2006). Do male and female
consumers differ in the amounts they spend? The average expenditure
in a sample survey of 56 male consumers was $130, and the average
expenditure in a sample survey of 34 female consumers was $66.
Based on past surveys, the standard deviation for male consumers is
assumed to be $30, and the standard deviation for female consumers
is assumed to be...

The average expenditure on Valentine's Day was expected to be
$100.89 (USA Today, February 13, 2006). Do male and female
consumers differ in the amounts they spend? The average expenditure
in a sample survey of 40 male consumers was $140, and the average
expenditure in a sample survey of 34 female consumers was $69.
Based on past surveys, the standard deviation for male consumers is
assumed to be $33, and the standard deviation for female consumers
is assumed to be...

The average expenditure on Valentine's Day was expected to be
$100.89 (USA Today, February 13, 2006). Do male and female
consumers differ in the amounts they spend? The average expenditure
in a sample survey of 52 male consumers was $140, and the average
expenditure in a sample survey of 38 female consumers was $62.
Based on past surveys, the standard deviation for male consumers is
assumed to be $33, and the standard deviation for female consumers
is assumed to be...

The average expenditure on Valentine's Day was expected to be
$100.89 (USA Today, February 13, 2006). Do male and female
consumers differ in the amounts they spend? The average expenditure
in a sample survey of 50 male consumers was $135.78 , and the
average expenditure in a sample survey of 39 female consumers was
63.35. Based on past surveys, the standard deviation for male
consumers is assumed to be $30, and the standard deviation for
female consumers is assumed to...

The average expenditure on Valentine's Day was expected to be
$100.89 (USA Today, February 13, 2006). Do male and female
consumers differ in the amounts they spend? The average expenditure
in a sample survey of 60 male consumers was $134.44, and the
average expenditure in a sample survey of 33 female consumers was
$63.97. Based on past surveys, the standard deviation for male
consumers is assumed to be $31, and the standard deviation for
female consumers is assumed to be...

The USA Today reports that the average expenditure on
Valentine's Day is $100.89. Do male and female consumers differ in
the amounts they spend? The average expenditure in a sample survey
of 43 male consumers was $135.67, and the average expenditure in a
sample survey of 37 female consumers was $68.64. Based on past
surveys, the standard deviation for male consumers is assumed to be
$36, and the standard deviation for female consumers is assumed to
be $18.
What is...

The USA Today reports that the average expenditure on
Valentine's Day is $100.89. Do male and female consumers differ in
the amounts they spend? The average expenditure in a sample survey
of 44 male consumers was $135.67, and the average expenditure in a
sample survey of 31 female consumers was $68.64. Based on past
surveys, the standard deviation for male consumers is assumed to be
$32, and the standard deviation for female consumers is assumed to
be $18.
What is...

The USA Today reports that the average expenditure on
Valentine's Day is $100.89. Do male and female consumers differ in
the amounts they spend? The average expenditure in a sample survey
of 49 male consumers was $135.67, and the average expenditure in a
sample survey of 32 female consumers was $68.64. Based on past
surveys, the standard deviation for male consumers is assumed to be
$37, and the standard deviation for female consumers is assumed to
be $19. What is...

The USA Today reports that the average expenditure on
Valentine's Day is $100.89. Do male and female consumers differ in
the amounts they spend? The average expenditure in a sample survey
of 50 male consumers was $135.67, and the average expenditure in a
sample survey of 35 female consumers was $68.64. Based on past
surveys, the standard deviation for male consumers is assumed to be
$31, and the standard deviation for female consumers is assumed to
be $19.
What is...

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