Friday

May 6, 2016
**Math - Statistics**

The increase or decrease in the price of a stock between the beginning and the end of a trading day is assumed to be an equally likely random event. What is the probability that a stock will show a decrease in its closing price on eleven consecutive days? (Round to four ...
*Friday, June 19, 2015 by Derrin*

**Statistics**

How do you find the p-value??? Thanks! In the past, 35% of the students at ABC University were in the Business College, 35% of the students were in the Liberal Arts College, and 30% of the students were in the Education College. To see whether or not the proportions have ...
*Friday, June 19, 2015 by Becca*

**statistics**

P( 1.05 < Z < 2.05) Need help solving please
*Thursday, June 18, 2015 by belle*

**Statistics **

A researcher conducts a test on the effectiveness of a cholesterol treatment on 114 total subjects. Assuming the tails of distributions are normal distribution, is there evidence that the treatment is effective? What is the Null and alternative hypothesis.
*Thursday, June 18, 2015 by James*

**Statistics**

X 0 1 2 3 4 5 6 7 8 P(x) 0.05 0.1 0.3 0.1 0.1 0.1 0.1 0.1 0.05 =As the manager you check the cashier ( to see if you need to open a new cashier line). What is the probability that you find exactly 2 people waiting in line? please need to know how to solve it
*Wednesday, June 17, 2015 by Larry*

**statistics**

a private opinion poll is conducted for a politician to determine why proportion of the population favors decriminalizing marijuana possession. how large a sample is needed in order to be 90 percent confident that the sample proportion will not differ from the true proportion ...
*Monday, June 15, 2015 by ash*

**statistics**

twelve different vTideo games showing substance use were observed and the duration times of game play (in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the sample data to construct a 95...
*Monday, June 15, 2015 by melissa jones*

**Statistics **

A random sample of 100 cable TV movies contained an average of 3.38 acts of physical violence per program. At the 99% level what is your estimate of the population value? mean = 3.38 s = 0.30 N = 100
*Sunday, June 14, 2015 by Christina *

**Statistics**

A researcher measures how positive a person’s mood is and how creative he or she is, obtaining the following interval scores: Participant Mood X Creativity Y 1 10 7 2 8 6 3 9 11 4 6 4 5 5 5 6 3 7 7 7 4 8 2 5 9 4 6 10 1 4 (a) Compute the statistic that summarizes this ...
*Saturday, June 13, 2015 by baegirl*

**Statistics**

A researcher finds that the correlation between variable A and variable B is r = 1.20. She also finds that the correlation between variable C and variable B is r = 2.40. Which relationship is scientifically more useful and by how much?
*Saturday, June 13, 2015 by baegirl*

**statistics**

what is the r value
*Saturday, June 13, 2015 by tracy*

**Statistics**

Suppose that a SRS of 900 12th-graders has x̅ =148. Based on this sample, a 95% confidence interval for μ is? (σ=35) I tried using x̅ +/- z*(σ/sqrt n), so 148 +/- 1.960(35/sqrt900, but it doesn't work. What am I doing wrong?
*Friday, June 12, 2015 by Ceres*

**sTATISTICS**

Give examples of each of the aforementioned events.
*Friday, June 12, 2015 by Anonymous*

**Statistics**

Please help, thank you!! A researcher measures how positive a person’s mood is and how creative he or she is, obtaining the following interval scores: Participant Mood X Creativity Y 1 10 7 2 8 6 3 9 11 4 6 4 5 5 5 6 3 7 7 7 4 8 2 5 9 4 6 10 1 4 (a) Compute the statistic ...
*Friday, June 12, 2015 by baegirl*

**Statistics**

Please Help, thank you! A researcher measures the following scores for a group of people. The X variable is the number of errors on a math test, and the Y variable is the person’s level of satisfaction with his/her performance. (a) With such ratio scores, what should the ...
*Friday, June 12, 2015 by baegirl*

**Statistics**

A doctor want to estimate the HDL cholesterol of all 20- to 29- year old females. how many subjects are needed to estimate the HDL cholesterol within 3 points with 99% confindence assuming s=15.8 based on earlier studies?
*Friday, June 12, 2015 by Sonya *

**Statistics**

A recruiter estimates that if you are hired to work for her company and you put in a full week at the commissioned sales representative position she is offering, you will make “$525 plus or minus $250, 80% of the time.” She adds, “It all depends on you!” If...
*Thursday, June 11, 2015 by shuggins*

**Statistics**

The total area under the control distribution curve is equal to a probability of what?
*Thursday, June 11, 2015 by John*

**statistics**

In blackjack with one card dealt already? What is the probability it is a Ace, given that it is not a face card?
*Tuesday, June 9, 2015 by cat*

**statistics**

A daily lottery is conducted in which two winning numbers are selected out of 100 numbers. How many different combinations of winning numbers are possible?
*Tuesday, June 9, 2015 by Donna*

**statistics**

If there were fifteen cards left in the deck, and five were diamonds, what is the probability that two cards dealt (without replacement) would both be diamonds?
*Monday, June 8, 2015 by cat*

**Statistics**

A roulette wheel has 38 slots, numbered 0, 00, and 1 to 36. Two slots are green, 18 of the others are red, and 18 are black. a) What is the probability of winning with a bet on red in a single play of roulette? b) You decide to play roulette 4 times, each time betting on red. ...
*Sunday, June 7, 2015 by Luke*

**statistics**

Last year, community hospital had 23652 admissions. of these, 1569 were readmissions. What is the hospital's readmission rate? round to two decimal places.
*Sunday, June 7, 2015 by laverne*

**statistics**

last month, the release of information specialist received 232 requests for information. He was able to answer 176 within thee specified time frame of three working days. What is the rate of compliance in answering requests within the specified time frame? Round to two decimal...
*Sunday, June 7, 2015 by laverne*

**statistics**

The forms used in your coding area cost $100.00 per 1000 forms for the first 2000 and $50 for every 1,000 thereafter If you need to order 5,000 forms what is the total cost?
*Sunday, June 7, 2015 by laverne*

**Statistics**

The HIM coding supervisor agrees to pay a new graduate $13.50 per hour. This is a full-time coding position at 2,080 hours per year. The cost for a full-time employee's fringe benefits is 24 percent of the employee's salary. How much must the supervisor budget for the ...
*Sunday, June 7, 2015 by laverne*

**statistics**

Community health center, a new patient clinic in your town serving only underinsured and uninsured patients, has asked you to help its HIM department get started. Calculate the number of new shelving units needed for a medical record filing system based on eight shelves per ...
*Sunday, June 7, 2015 by laverne*

**HELP!! Statistics!**

The accompanying data table lists measured voltage amounts supplied directly to a family’s home. The power supply company states that it has a target power supply of 120 volts. Using these home voltage amounts, test the claim that the mean is 120 volts. Use a 0.05 ...
*Wednesday, June 3, 2015 by Lynn*

**STATISTICS**

Find the approximate 84th percentile of the pig pregnancy length distribution
*Tuesday, June 2, 2015 by Ashley*

**Math (Statistics)**

Without calculating values of z, tell which of these sample means will have the most extreme standardized score and which will have the least extreme standardized score. 40, 30, 25, 20.
*Sunday, May 31, 2015 by Debbie*

**Statistics**

12.34 Screening job applicants. A company retains a psychologist to assess whether job applicants are suited for assembly-line work. The psychologist classifies applicants as one of A (well suited), B (marginal), or C (not suited). The company is concerned about the event D ...
*Saturday, May 30, 2015 by Mary*

**Statistics **

a new restaurant with 149 seats is being planned. Studies show that 61% of the customers demand a smoke-free area. How many seats should be in the non-smoking are in order to be very sure of having enough seating there?
*Saturday, May 30, 2015 by Nicoleta *

**science**

1. Descriptive statistics are widely used in qualitative research. When establishing if a population is normally distributed explain when the statistics of sample size, mean, mode, median, skewness and kurtosis will guide the researcher to make conclusions of a normal ...
*Saturday, May 30, 2015 by jonathan*

**statistic**

let y1<y2<y3 be the order statistics of random sample of size a distribution f(x)=2x , 0<x<1 show that z1=y1/y3, z2=y2/y3 ,z3=y3 are mutually stochastically independent
*Wednesday, May 27, 2015 by assma*

**Statistics 2023**

Suppose there is a 11.2% probability that a randomly selected person is aged 20 years or older and is also a jogger. In addition there is a 23.8% chance that a person is 20 years or older, female, given that he or she also jogs. What is the probability a randomly selected ...
*Wednesday, May 27, 2015 by Alexander*

**Elementary Statistics**

determine whether the given is a statistics or parameter. 1.) There are 50 capitol states in the US. Answer: Parameter 2.) Among the flights included in the sample of flights in Data set 15 in Appendix B, 21% arrived late. Answer: Statistics
*Tuesday, May 26, 2015 by Mar*

**Statistics**

Tennis Ball Manufacturing: A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from a height of 100 inches, the company wants the mean height of a ball’s bounce upward to be 55.5 inches. This average is maintained by periodically...
*Tuesday, May 26, 2015 by Rose*

**Statistics**

The performance of students is given by the following result: 52,74,54,12,47,36,48,84,65,42,15,45,74,36, 47,53,57,32,41 and 58. If the pass mark is 50. What is the probability that a student should score 84?
*Monday, May 25, 2015 by Amidal*

**Statistics**

The interpretation of a test of significance can depend on the sample size and the practical context of the test. Write a short explanation of how sample size can affect the decision about statistical significance and whether or not the result is of any practical significance.
*Saturday, May 23, 2015 by Alex*

**Statistics**

The average mark on an entrance exam was 70%, with a standard deviation of 9.6. In order to be accepted you must get 60% or better. If 800 students wrote the exam how many were accepted?
*Thursday, May 21, 2015 by Sally*

**Statistics**

Mary has a savings account and is earning 10% annual interest compounded semi-annually. If she deposits $2,000 in the account every six months for three years, what will the future value of her account be? How much interest will she have earned?
*Wednesday, May 20, 2015 by Carrie*

**math**

let y1<y2<y3 be the order statistics of random sample of size a distribution f(x)=2x , 0<x<1 show that z1=y1/y3, z2=y2/y3 ,z3=y3 are mutually stochastically independent
*Tuesday, May 19, 2015 by assma*

**Statistics**

Scores on the Scholastic Aptitude Test form a ND with a mean of 500 and SD of 100 what is the minimum score necessary to be in the top 15% of the SAT distribution? Stuck on what to do on this question? Any answers?
*Tuesday, May 19, 2015 by Tom*

**Statistics HELP!**

Use a normal approximation to find the probability of the indicated number of voters. In this case assume that 119 eligible voters aged 18-24 are randomly selected. Suppose a previous study showed that among eligible voters aged 18-24, 22% of them voted. The probability that ...
*Monday, May 18, 2015 by Lynn*

**Healthcare Statistics**

A coding supervisor must determine the number of full time equilvalents (FTEs) needed to code 500 discharges per week. If it takes an average of twenty minutes to code each record and each coder works 7.5 productive hours per day, how many FTEs will the coding supervisor need?
*Monday, May 18, 2015 by Reannon*

**statistics**

suppose i guess that the average income of a family is $40,000. Display a test of the hypothesis that the mean of the numerical variable equals the value of the guess given versus the alternative that it does not equal this value. then what would be my decision at the 5% ...
*Sunday, May 17, 2015 by Mary*

**Statistics**

If np ≥ 5 and nq ≥ 5, estimate P (fewer than 4) with n = 13 and p = 0.5 by using the normal distribution as an approximation to the binomial distribution; if np < 5 or nq <5, then state that the normal approximation is not suitable. P (fewer than 4) =
*Sunday, May 17, 2015 by Lynn*

**statistics**

A sample of 65 night-school students' ages is obtained in order to estimate the mean age of night-school students. x bar = 25.2 years. The population variance is 28. (a) Give a point estimate for ì. (Give your answer correct to one decimal place.) Correct: Your ...
*Thursday, May 14, 2015 by haley*

**statistics**

A simple random sample of 1350 registered voters shows that 58% favor Candidate A over Candidate B. Construct a 99% confidence interval for the percent of the population of all registered voters who prefer Candidate A over Candidate B.
*Wednesday, May 13, 2015 by justin*

**Statistics**

The manager of a company wants to investigate job satisfaction among its employees. One morning after a meeting, she talks to all 25 employees who attended. Does this sampling plan result in a random sample? What type of sample is it? Explain.
*Wednesday, May 13, 2015 by Scott*

**Statistics**

The average daily high temperatures in Lawton are approximately normally distributed with a mean of 58 degrees and a standard deviation of 12 degrees. Find the probabilities below: The probability that the high would not exceed 65 degrees on any one day. The probability that ...
*Monday, May 11, 2015 by Gabriella*

**Statistics**

A survey was conducted to determine the number of hours people listen to the radio. While most of the listening is in the car, it turns out that the mean is 2.5 hours with a standard deviation of 0.75 hours. Find the probability that the sum of 80 values is greater than 190.
*Monday, May 11, 2015 by Jake*

**statistics**

The Wall Street Journal reported that automobile crashes cost the United States $162 billion annually (The Wall Street Journal, March 5, 2008). The average cost per person for crashes in the Tampa, Florida, area was reported to be $1599. Suppose this average cost was based on ...
*Monday, May 11, 2015 by SV*

**Psych Statistics**

Im trying to use Tukey's HSD but I don't know how to get the qk part of the formula?
*Monday, May 11, 2015 by Deborah*

**Stats**

Makers of a new pain-relieving medication claim that it relieves chronic pain faster than the current top-selling pain reliever on the market. A double-blind experiment was conducted in which 10 people who experience chronic pain were randomly selected to take either the new ...
*Sunday, May 10, 2015 by Serena*

**Statistics**

A random sample of 150 pumpkins is obtained and the mean circumference is found to be 45 cm. Assuming that the population standard deviation is known to be 1.8 cm, use a 0.03 significance level to test the claim that the mean circumference of all pumpkins is greater than 38 cm.
*Saturday, May 9, 2015 by Robin*

**Statistics**

The length of time for one individual to be served at a cafeteria is a random variable having an exponential distribution with a mean of 4 minutes. What I the probability that a person is served in less than 3 minutes on at least 4 of the next 6 days?
*Friday, May 8, 2015 by Jeannette*

**Statistics**

A countrywide estate agency specializes in selling commercial ventures. Their records show that the mean selling time is less than 90 days. Because of recent economic conditions, they believe that the mean selling time is now greater than 90 days. A countrywide survey of 100 ...
*Wednesday, May 6, 2015 by Frans*

**Business Statistics**

The Bureau of Labor Statistics’ American Time Use Survey showed that the amount of time spent using a computer for leisure varied greatly by age. Individuals age 75 and over averaged 0.30 hour (18 minutes) per day using a computer for leisure. Individuals ages 15 to 19 ...
*Tuesday, May 5, 2015 by Kim*

**Statistics**

The number of automobile accidents per day in a particular city is believed to have a Poisson distribution. A sample of 80 days during the past year gives the following data. Compute the value of the test statistic. Use α=0.05. Number of Occurrences /Observed Frequency (...
*Tuesday, May 5, 2015 by Nobin*

**Statistics**

A particular fruit's weights are normally distributed, with a mean of 353 grams and a standard deviation of 6 grams. If you pick one fruit at random, what is the probability that it will weigh between 334 grams and 344 grams?
*Monday, May 4, 2015 by Daniel*

**Statistics**

The estimate of the population proportion is to be within plus or minus 0.06%, with a 99% level of confidence. The best estimate of the population proportion is 0.22. How large a sample is required? Round answer to the next whole number.
*Sunday, May 3, 2015 by Tiffany*

**statistics**

8.value: 10.00 points The fracture strength of a certain type of manufactured glass is normally distributed with a mean of 509 MPa with a standard deviation of 17 MPa. (a) What is the probability that a randomly chosen sample of glass will break at less than 509 MPa? (Round ...
*Saturday, May 2, 2015 by Anonymous*

**Statistics**

SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many...
*Saturday, May 2, 2015 by Sara*

**statistics**

Probability: How many ways can a person select 4 programs from a television guide of 16 programs?
*Thursday, April 30, 2015 by vera*

**Algebra 2/Statistics**

From a squad of 12 cheerleaders, 10 will assemble themselves into a 4-level pyramid at the Homecoming rally. 1.) How many different combinations of cheerleaders can be used to build the pyramid? For this I got 12C10=66......Right or Wrong? 2.) The coach decides that Alexis ...
*Thursday, April 30, 2015 by Jordan*

**Algebra 2/statistics**

On a fair 6-sided die, each number has an equal probability p of being rolled. when a fair die is rolled n times, the most likely outcome (the mean) is that each number will be rolled NP times, with a standard deviation of sqrt NP(1-P). Brandon rolls a die 200 times. He will ...
*Thursday, April 30, 2015 by Jordan*

**statistics HELP**

A student asks if it is possible to have a standard deviation of -5. How do you respond?
*Wednesday, April 29, 2015 by Enis*

**Statistics PLEASE HELP**

A flashlight has 8 batteries, 2 of which are defective. If you select 2 batteries, find the probability that You select at least 1 good battery
*Monday, April 27, 2015 by Kalee*

**Statistics**

A multiple choice test has 24 questions each having 4 possible answers. If you guess each answer, find the probability of getting Between 9 and 15 correct
*Monday, April 27, 2015 by Kalee*

**Statistics**

A flashlight has 8 batteries, 2 of which are defective. If you select 2 batteries, find the probability that You select at least 1 good battery
*Sunday, April 26, 2015 by Kalee*

**statistics**

If a pair of dice (one red; the other blue) are rolled, Find the probability of landing on at least one odd number
*Sunday, April 26, 2015 by Kalee*

**Statistics**

If a pair of dice (one red; the other blue) are rolled, Find the probability of landing on a sum of 9
*Saturday, April 25, 2015 by Kalee*

**STATISTICS**

IQ scores distribution of IQ scores is normally distributed standard with a mean of 100 and a standard deviation of 15, which is represented by a bell-shaped graphical. What is the area under the curve? What is the median? What is the mode?
*Saturday, April 25, 2015 by norma*

**statistics**

IQ scores distribution of IQ scores is normally distributed standard with a mean of 100 and a standard deviation of 15, which is represented by a bell-shaped graphical. What is the area under the curve? What is the median? What is the mode?
*Saturday, April 25, 2015 by norma*

**statistics**

IQ scores distribution of IQ scores is not normally distributed standard with a mean of 100 and a standard deviation of 15, which is represented by a bell-shaped graphical. What is the area under the curve? What is the median? What is the mode?
*Saturday, April 25, 2015 by norma*

**statistics**

assume that the odor threshold for untrained noses is normal with a standard deviation of 7. the odor thresholds for these 10 noses are: 31, 31, 43, 36, 23, 34, 32, 30, 20 and 24. is there evidence that the mean threshold for untrained tasters is greater than 25 micrograms per...
*Friday, April 24, 2015 by Mary*

**statistics**

would the null hypothesis that the 2000 mean hourly earnings of all workers was $16 be rejected at the 10% significance level in favor of the two-sided alternative? What about the null hypothesis that the mean was $15?
*Friday, April 24, 2015 by Mary*

**Psychology**

HELP !!! Which statistics concept is described? Choose from these answers: [(A):statistical test] [(B):Null Hypothesis] [(C):alpha] [(D):one-tailed test] [(E):two-tailed test] [(F):Type I error] [(G):Type II error] [(H):the statistic Z] 1)When a hypothesis is that two groups ...
*Friday, April 24, 2015 by Anonymous*

**Math, Statistics**

Find two z-scores so that 40% of the data in the distribution lies between them. (More than one answer is possible). Include a sketch of the distribution with 40% of the area shaded and the corresponding z-scores included. I'm not sure how to do this problem. Just need a ...
*Friday, April 24, 2015 by Lita*

**MATH**

HELP !!! Which statistics concept is described? Choose from these answers: [(A):statistical test] [(B):Null Hypothesis] [(C):alpha] [(D):one-tailed test] [(E):two-tailed test] [(F):Type I error] [(G):Type II error] [(H):the statistic Z] 1)When a hypothesis is that two groups ...
*Friday, April 24, 2015 by Anonymous*

**statistics**

For a given set of data, it is known that x = 10 and y = 4. The gradient of the regression line y on x is 0.6. Find the equation of the regression line and use it to estimate y when x = 8.
*Friday, April 24, 2015 by ednah*

**Statistics **

What is the test scores of 4, X, 1, 2 and 5 have a mean of 10. What is the value 4 1 2 :10 15
*Thursday, April 23, 2015 by Bee*

**Statistics**

I have been working on the following homework problem: Consider Homer and Bart's consumption of potato chips and donuts. Suppose that Marge is in the room 30% of the time that Bart is eating chips and 40% of the time that Bart is eating donuts. Similarly, suppose that ...
*Thursday, April 23, 2015 by W*

**statistics**

if alpha increases will beta increase or decrease? or are they not related?
*Thursday, April 23, 2015 by Anonymous*

**statistics**

Airline overbooking is a common practice. Many people make reservations on several flights due to uncertain plans and then cancel at the last minute or simply fail to show up. Jet Green airlines’ planes hold 100 passengers. Past records indicate that 20% of the people ...
*Thursday, April 23, 2015 by carlos*

**Calculating and Reporting Healthcare Statistics**

How do you: Calculate the total inches of documents filed per day for all clerks. Calculate the total documents filed per day for all clerks. Calculate the weekly total inches of documents filed per clerk (round to two decimal points). Calculate the weekly total documents ...
*Thursday, April 23, 2015 by Kat*

**Statistics**

The TreeDropped Fruit Company wants to sell its apples in pink and yellow gift boxes. To design the boxes, the company needs to estimate the average diameter of their apples. A random sample of 50 apples has a mean of 4.1 inches. Using previous research you assume a population...
*Thursday, April 23, 2015 by Jenny*

**Statistics**

In a sample of 200 people, 154 said they watched educational television. Find the 90% confidence interval of the true proportion of people who watch educational television. If the television company wanted to publicize the proportion of viewers, do you think it should use the...
*Wednesday, April 22, 2015 by Ale*

**Statistics**

An automatic machine in a manufacturing process is operating properly if the length of an important subcomponent is normally distributed with a mean μ = 80 cm and a standard deviation σ = 2 cm. a) Find the probability that the length of one randomly selected unit is ...
*Wednesday, April 22, 2015 by Lia*

**Statistics**

A simple random sample is conducted of 1486 young adults who were once college students seeking bachelor’s degrees at a specific university. The study found that 780 of these young adults actually earned bachelor’s degrees. Use a 0.05 significance level to test the ...
*Wednesday, April 22, 2015 by Giselle*

**Statistics**

A savings and loan association needs information concerning the checking account balances of its local customers. A random sample of 20 accounts was checked and yielded a mean balance of $664.14 and a standard deviation of 235.29. Assume the data is normally distributed. Find ...
*Wednesday, April 22, 2015 by Giselle*

**Statistics**

A modification is made to a computer component to try to increase its mean time between failures, which was originally 520 hours. Tests on a simple random sample of 10 modified components resulted in the following times (in hours) between failures. Assume that the sample comes...
*Wednesday, April 22, 2015 by Giselle*

**Statistics **

The daily sales of a retail store are normally distributed with a standard deviation of $500. If the probability that sales will be less than $10,000 in any one day is 40%, what are the mean daily sales?
*Wednesday, April 22, 2015 by Anonymous*

**Statistics **

What is the lowest z-value for the highest 2% of observations on the standard normal distribution?
*Wednesday, April 22, 2015 by Anonymous*

**Statistics **

What is the lowest z-value for the highest 2% of observations on the standard normal distribution?
*Wednesday, April 22, 2015 by Alisha*

**Statistics **

A manufacturer makes ball bearings that are supposed to have a mean weight of 30g. A retailer suspects that the mean weight is actually less than 30 g. The mean weight for a random sample of 16 ball bearings is 28.8 g with a standard deviation of 3.9 g At the 0.05 significance...
*Wednesday, April 22, 2015 by Leslie667*

**Statistics**

Find the minimum sample size needed to estimate the population proportion if the margin of error is 0.07 confidence level is 95% and from a prior study p hat is estimated by decimal equivalent of 94% A) 39 b)45 c)43 d)44
*Wednesday, April 22, 2015 by Leslie667*

**Statistics **

Find the minimum sample size needed to estimate the population proportion if the margin of error is 0.07 confidence level is 95% and from a prior study p hat is estimated by decimal equivalent of 94% A) 39 b)45 c)43 d)44
*Tuesday, April 21, 2015 by Leslie667*

**Genetics**

A researcher who has pioneered cell-free fetal DNA testing to detect trisomies has received threats from people accusing her of killing babies. she counter that the test will actually saves lives. explain how the test can do this the accuracy statistics on cell-free fetal DNA ...
*Tuesday, April 21, 2015 by Shala*