Ratio of variance in spending for males and females

Assignment Help Basic Statistics

Reference no: EM13965266

The management of a supermarket wanted to study the spending habits of its male and female customers. A random sample of 16 male customers who shopped at this supermarket showed that they spent an average of $55 with a standard deviation of $12. Another random sample of 25 female customers showed that they spent $85 with a standard deviation of $20.50. Assuming that the amounts spent at this supermarket by all its male and female customers were approximately normally distributed, construct a 90% con?dence interval for the ratio of variance in spending for males and females, σ2/σ2.

Reference no: EM13965266

Questions Cloud

What happens when tukeys procedure is applied : Consider the accompanying data on plant growth after the application of five different types of growth hormone. Perform an F test at level a = .05. What happens when Tukey's procedure is applied?

Purchase of a new machine for stamping out : An appliance manufacturer is considering the purchase of a new machine for stamping out sheet metal parts. If μ0 (given) is the true average of the number of good parts stamped out per hour by their old machine and μ is the corresponding true unkn..

Effectiveness of a new method of teaching algebra : An experiment is conducted comparing the effectiveness of a new method of teaching algebra for eighth-grade students. Twelve gifted and 12 regular students are taught using this method. Their scores on a ?nal exam are shown in the following table.

Do the other four rays meet in one spot : A plane mirror is placed in front of a multiple ray projector so that the central ray is back upon itself. The other rays are adjusted so they are also reflected back on themselves. In this way, all 5 rays are parallel. A concave mirror is placed ..

Ratio of variance in spending for males and females : Assuming that the amounts spent at this supermarket by all its male and female customers were approximately normally distributed, construct a 90% con?dence interval for the ratio of variance in spending for males and females, σ2/σ2.

What is the magnification of the lens combination : An object is placed 30 cm to the left of a converging lens of focal length 15 cm, and a diverging lens of focal length 20 cm is placed 45 cm to the right of the first lens. How far from the original object is the final image? What is the magnifica..

Draw and solve the cash flow diagram for annual value : Draw and solve the Cash Flow Diagram for Annual Value "A". This is a 10 year Cash Flow, and interest rate is a compounded 7%).

Con?dence interval for difference in two population means : Suppose these means were based on a random sample of 100 homes in 1997 and 150 homes in 1998 and that the sample standard deviations of sale prices were $21,000 for 2000 and $23,000 for 2001. Find a 98% con?dence interval for the difference in the ..

Levels of well-nourished and undernourished : In order to compare the mean hemoglobin (Hb) levels of well-nourished and undernourished groups of children, random samples from each of these groups yielded the following summary.

User Account

All Pages