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Descriptive Statistics

Joint density...

The joint density of X and Y is given by f(x,y)= {xe to the power -(z+y) x>0, y>0 0 otherwise. Are X and Y independent? What if f(x,y) were given by f(x,y)= {2 0<x<y, 0<y<1 0 otherwise.

Derive Equation

Given the attached equation, mathematically prove the second equation ...

Linear Programming problem

Problem # 1 The following is the current mathematical model for the production of Standard and Deluxe Bags by Par Manufacturing. Max 10s + 9d s.t. 7/10s +1d is < or equal to 630 1/2s + 5/6 d < or equal to 600 1s + 2/3 d < or equal to 708 1/10s + 1/4d < or equal to 135 S, D, > or equal to 0 Optimal Solution =

Only for 103139,103997, 103866, 103940, or 103642 only

Only for above list Blood groups and Rh types of 100 randomly selected persons. If 1 of the 100 persons is randomly selected, find P(Group A or Rh+) and type a decimal Group A: 28Rh+ 7Rh- GroupB: 13+Rh 5Rh- GroupAB: 3Rh+ 4Rh- Group O: 34Rh+ 6Rh- Please show math involved

Mean

Problem: P that temperature is between -1.36 and 3.56 with a mean of 0 and a standard deviation of 1.

I'm stuck on this problem.

Suppose you are an appraiser for homes in a metropolitan area. Discuss two quantitative variables and two qualitative variables that would apply.

Problem 67

67. The following data show that trailing 52 week primary share earnings and books values as reported by 10 companies(the wall Street Journal, March 13/2000). Company -Earnings-Book Value Am Elec -25.21 -2.69 Columbia En -23.20 -3.01 Con Ed -25.19 -3.13 Duk

I am stuck on this problem

A seven year old study reported that women whose mothers used the drug DES during pregnancy were twice as likely to develop tissue abnormalities that might lead to cancer as women whose mothers did not take the the drug. a. This study involved the comparison of two populations. What were the populations? b. Do you suppose

Histograms and Measures of Central Tendency

Please see the attached file for the fully formatted problems. A. 100 lengths of steel bar were measured and their lengths In centimetres (cm) are given in the table labelled Item 36 on your worksheet. i) Plot a histogram of the data provided. ii) Calculate forthe data: a) The arithmetic mean length. (Show all working). b

Sports Statistics: How Long Does A Ball Bounce?

A ball bounces 1/2 its height each bounce. It is dropped from a height of one foot. a) How many times does it bounce? b) How far does it bounce? c)How long does it bounce? Does it ever come to rest? (Please show work)

Sports Statistics Problem

How high will the fourth ball bounce if a stack of 4 balls is dropped from a height of 5 feet? Assume the usual perfectly resilient balls and large mass ratios.

Statistical Quality Control - Question2

The number of "near misses" recorded for the last 20 months at the Lima Intl Airport is 3,2,3,2,2,3,5,1,2,2,4,4,2,6,3,5,2,5,1, 3. Develop an appropriate control chart . Determine the mean number of misses per month and the limits on the number of misses per month. Show all your work/calculations . Are their any months where

Only for OTA 103997

Only for above listed OTA. Suppose women's heights have a mean of 63.6 inches and a stan. dev. of 2.5 inches. Women basketball players must be in top 60% of heights to be eligible for WNBA. Find the height that separates the top 60% from the bottom 40%.

Only OTA 103997 or 103642 only

Only for above listed OTAs Pregnancies: normally 268 days is the mean and a stan.dev. of 15 days. If we say a baby is premature if born at least 3 weeks early, what % are born prematurely?????

GM engineers want to estimate mean driver response time

GM engineers want to estimate mean driver response time to a new break light standard Deviation with the symbol Q upsidedown is known to be .15. fifty drivers have a mean response time of .72. find a 90% confidence interval.

3755- data presentation

Subject: How do I present an explaination of this data Details: I am suppose to present a half page Explaination of the data collected, by using statistical expressions. Survey for Statistics: 1. Age ____________ 2. Height ____________ 3. Weight ____________ 4. Favorite Activity ____________ 5.

Creating histograms and calculating means and variances.

Rent Resident: Amount of monthly profit from residential rent homes There is a data file attached. Rent Commercial: Amount of monthly profit from rent paid on commercial buildings. A realtor owns numerous residential and commercial buildings and collects rent on these properties. The realtor selects 100 months over t

A scientist studying babies born prematurely...

Please see the attached file for full problem description. --- A scientist studying babies born prematurely would like to obtain an estimate for the mean birth weight, , of babies born during the th week of the gestation period. She plans to select a random sample of birth weights of such babies and use the mean of the sam

Four symmetrical distributions

Four symmetrical distributions, labeled (a), (b), (c), and (d), are represented below by their histograms. Without performing any calculations, order the respective standards deviations σ_a, σ_b ,σ_c , and σ_d of the distributions. A X X X X X X X X

Distributions

Four distributions, labeled (a), (b), (c), and (d), are represented below by their histograms. Without performing any calculations, order the respective means , , , and of the distributions. A X X X X X X X X X 1 2

Integer Problem

I need to verify my work and need help with work on Exercises 4, 5, 6, 7 from attached PDF file and Excel file. Please help soon. Please find the attached zip file for all the related files. 4. The Big Bang Novelty Company makes three basic types of noise-makers: Toot, Wheet, and Honk. A Toot can be made in 30 minutes and has

Integer Problem

I need to verify my work and need help with work on Exercises 1, 2, 3 from attached PDF file and Excel file. Please help soon. Please find the attached zip file for all the related files. 1. A manager of a firm's research and development is currently reviewing a set of proposals prepared by her staff. She must soon decide w

Class Width

Using a class number of 8, a highest value of 259, and a lowest value of 125, find the class width.

Word Problem

At the time Beth was hired as a server at a Restaurant, she was told she could average $20 a day in tips. Over the first 35 days she was employed at the restaurant, the mean daily amount of her tips was $24.85 with a standard deviation of $3.24. At the .01 significance level, can Beth conclude that she is earning an average of

Inference for distributions

A). Find the mean IQ scores for girls and for boys. It is common for boys to have somewhat higher scores on standardized tests. It that true? b). Compute 95% T intervals of the Girls' IQ's and the Boys' IQ's and explain what these intervals mean. c). Make a histogram for each set of data to determine whether each distribu

Determining the reorder point and the optimal number

East value Distributors distributes industrial valves and control devices. The Eastern Valve Co. Has an annual demand of 20000 units and cost of $90 per unit. The cost of ordering is $100 per order and inventory-carrying cost is estimated to be 5 percent of the cost of each value. Lead-time is four working days. Determine(a