How do I know which distribution to use for the following and when/where do tables apply?: Nonstandard Normal Binomial Normal Standard normal Central limit theorem a) Mean is 0, stand. dev. is 0 degrees C., find P between 0.05 and 1.50 b)Mean is 63.6 and s.d. is 2.5; Club had requirement that women must be 70 inches
The average score on the math portion of the SAT was 516 in 2002. suppose that the math score of all students taking the SAT 2002 were normally distributed with a mean of 516 and a standard deviation of 90. a) what percentage of the students scored higher than 600 on this exam? b) what percentage of the students scored lower t
The diameter of a shaft in an optical storage drive is normally distributed with mean 0.2508 inch and standard deviation 0.0005inch. The specifications of the shaft are 0.2500+/-0.0015 inch. a.) What proportion of the shafts conforms to specifications? b.) What can be done to reduce non-conforming proportion?
Find the AREA BETWEEN the following scores on the normal curve given the MU and Sigma. MU 100; Sigma 15; Low Score 110; High Score 123 = Area?
Find the area below the following scores on the normal curve given Mu and Sigma. MU 100; Sigma 15; Score 123 = Area
A. n=17. Find P(t<-1.746) aa) .05 bb).95 cc).45 dd) 1.0 B. A random sample of 64 observations is observed from a population of SAT scores in 2001. Which of the following is a correct statement? aa) It is the distribution of the observed 64 SAT scores. bb) X-bar is approximately normal. cc) The mean of all possible x-bars is ave
If scores are normally distributed with a mean of 100 and a standard deviation of 15, what percent of the scores are: (a) greater than 100? (b) greater than 115? (c) between 100 and 130?
Suppose that the scores of architects on a particular creativity test are normally distributed. What percentage of architects have z scores (a) above .10 (b) below .10 (c)above .20 (d) below .20 (e) above 1.10 (f) below 1.10 (g) above -.10 (h) below -.10?
An airline wants to find out how long it takes for a travel agent to complete an airline ticket order from a computer terminal. Assume that the mean transaction time is 150 seconds. also assume that the population of transaction times has normal frequency curve. Find the probability that the 150 and 175 seconds to complete if s
Only for above listed OTA. Last one for this semester. Thank you. Hope you're around mid- June through July. Have a great summer! Problem: In a stan. normal distribution, find the z-score that separates the top 20% area from the bottom 80%.
Body Temperatures normally distributed with a mean of 98.2 and a stan. dev. of 0.62. if 100 people randomly selected find probability their mean body temperature is between 98.15 and 98.5 degrees.
Only for above listed OTA's Assume thermometer readings are normally distributed with a mean of 0 degree and a Standard deviant of 1.00 degree F. Find indicated probability where z is reading in degrees. P(z<1.645)
Tthe mean for a special distribution is 100 and the standard deviation is 15. What is the estimated percentile for an individual who had a score of 90 on this scale?
1). In a normal distribution with a standard deviation of 5.0, the probability that an observation selected at random exceeds 21 is 0.14 (14%). a). Find the mean of the distribution. b). Find the value of below which 4 percent of the values in the distribution lie. 2). The company's manager calculates that it requires
1) What percentage of this model radio will last longer than 9.5 years? 2) Suppose the manufacturer guarantees the radio for 8 years. What percentage of radios will have to be replaced? 3) Suppose the manufacturer is willing to replace only 2% of this model radio. What should be the length of the guarantee?
Assume normal distribution Find critical z values Left tailed test; alpha = 0.05
Nurses saleries are Normally distributed with mean of 35,000 and standard deviation$1700. A. What is the probability that a nurse earn more than $36,000? B. What is the probality that a group of 10 nurses have mean salary greater than $36,000? c. What salary does a nurse need to earn to have a salary in the top 25% of nurses'
A pollster conducted a survy of voters' opinions on a local school bond issue. What would the 95 percent confidence limits be if 53 percent of 1000 people sampled were in favor of the school bond issue? What would the 99 percent confidence limits be for the same sample? I have SPSS 11.0 here. Can I enter this info into it and
I need some serious explanation. I cannot even understand what to study for the frist 6 questions on the test about the formula I posted in this subject line. The book I am using is Elementary Statistics by mario F. Triola. 8th edition. Here is what I am to study: Students will have 2 hours to answer 20 exam questions.
1. (a) Show that if Z1 and Z2 are independent standard normal random variables, then for all ρ (correlation), Z1 and ρZ1+sqrt(1-ρ2)*Z2 are standard normal with correlation ρ. (b) Show that for all ρ and v, T1 = (Z1)/sqrt(X/v)and T2 = (Z2)/sqrt(X/v) have correlation ρ, where Z1and Z2 are standa
The amounts dispensed by a cola machine follow the normal distribution with a mean of 7 ounces and a standard deviation of 0.10 ounces per cup. How much cola is dispensed in the largest 1 percent of the cups?
Statistics show that 69% of all college seniors have a job prior to graduation. If a random sample of 65 recent college graduates is taken, approximate the probability that at most 44 have a job prior to graduation. Do this in the following two ways: a. Use the normal approximation to the binomial without a correction for con
A light bulb manufacturer advertises that the average life for their light bulbs is 800 hours. A random sample of 15 of their light bulbs resulted in the following data, in hours; 990 841 953 612 727 800 686 594 835 897 943 791 750 667 723 Assume that the bulb life is normally distributed. At the 10% significance level, do
In the last municipal election, a sample of 350 registered voters showed that 85 voted for the incumbants. Find a 98% confidence interval estimate for the proportion of all voters voting for the incumbants.
A random sample of 55 adults in a certain country showed an average height of six feet (72 inches) for adults. Statistics show the population standard deviation to be 3.40 inches. Calculate the 95% confidence interval for the mean height of the adult population.
We are asked (ideally) to use Crystal Ball (CB), an Excel add-in, or Excel itself to do this inventory problem. CB would be ideal, but we can use just plain-old Excel if it can do what needs to be done. I see this as a simulation or maybe optimization problem, but not sure how to tackle it. Given historical data on deman
Suppose that the heights of adult women in the United States are normally distributed with a mean of 63.5 inches and a standard deviation of 2.4 inches. Jennifer is taller than 85 % of the population of U.S. women. How tall (in inches) is Jennifer? Carry your intermediate computations to at least four decimal places. Round you
It is known that the IQ scores of workers in a certain company are normally distributed with a standard deviation of ten. If 0.13% of the workers have IQ's in excess of 130 calculate the mean IQ.
According to the census, the average age of men marrying for the first time is 24 years. Assume ages of men are normally distributed with a standard deviation of three years. A) What is the probability that a man being married for the first time is older than 26 years? B) Before what age do 95% of men who marry for the first t
Foreign service employees receive housing allowances when posted abroad. These allowances average $30000 annually. Assume that a normal distribution applies and the standard deviation is $5000. A) What is the probability that a diplomat will receive a housing allowance exceeding $35000? B) What is the probability that a diplom