Question

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 the point estimate of the difference between the population mean expenditure for males and the population mean expenditure for females (to 2 decimals)?

At 99% confidence, what is the margin of error (to 2 decimals)?

Develop a 99% confidence interval for the difference between the
two population means (to 2 decimals). Use *z*-table.

Answer #1

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 40 male consumers was $135.67, and the average expenditure in a
sample survey of 30 female consumers was $68.64. Based on past
surveys, the standard deviation for male consumers is assumed to be
$39, and the standard deviation for female consumers is assumed to
be $24.
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 46 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
$30, and the standard deviation for female consumers is assumed to
be $16.
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 34 female consumers was $68.64. Based on past
surveys, the standard deviation for male consumers is assumed to be
$40, and the standard deviation for female consumers is assumed to
be $24.
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 42 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
$31, and the standard deviation for female consumers is assumed to
be $17.
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 43 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
$31, and the standard deviation for female consumers is assumed to
be $16.
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
$33, 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 47 male consumers was $135.67, and the average expenditure in a
sample survey of 38 female consumers was $68.64. Based on past
surveys, the standard deviation for male consumers is assumed to be
$39, and the standard deviation for female consumers is assumed to
be $24.
What is...

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