Effects of cocaine on children-researchers conducted a, Ask an Expert

Statistics

Effects of cocaine on children-researchers conducted a study to assess the effects that occur when children are exposed to cocaine before birth. On a measure of spatial/mathematical skill at age 4, the 190 children born to cocaine users had a mean of 7.3 and a standard deviation of 3.0. The 186 children not exposed to cocaine had a mean score of 8.2 with a standard deviation of 3.0.

(a) Construct a 99% confidence interval for the difference of the means.

(b) Interpret the interval using the context of the problem.

(c) Is there sufficient evidence to conclude that spatial/mathematical skill is significantly affected by exposure to cocaine before birth? Why or why not?

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9979507

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

Letnbspnmnbspv denote the normal random variable with

Let N ( m , v ) denote the normal random variable with mean m and variance v . (a) If X is a Standard Normal variable, what is the distribution of the random variable 4 X - 1? (b) If X ~ N (3,1) and Y ~ ...

In a fish tank there are 23 goldfish 4 angelfish and 9

In a fish tank, there are 23 goldfish, 4 angelfish, and 9 guppies. If a fish is selected at random, find the probability that it is an angelfish or a guppy.?

A few years ago simon powell purchased a home for 250000

A few years ago, Simon Powell purchased a home for $250,000. Today, the home is worth $450,000. His remaining mortgage balance is $200,000. Assuming that Simon can borrow up to 70 percent of the market value, what is the ...

A coin is randomly picked from a collection of 10 coins the

A coin is randomly picked from a collection of 10 coins, the ith coin having a probabiliity i/10 of coming up heads. The coin in then flipped repeatedly until a head appears. Let X be the number of flips necessary. Find ...

On average there are 30 of defects per square foot of

On average, there are 30% of defects per square foot of photographic paper. Assume independence. We examine 100 sheets of photographic paper. Find the probability of 0 defects in one sheet.

Suppose that a b and c are events in a sample space s such

Suppose that A, B and C are events in a sample space S, such that: A and B are equally likely; C is four times as likely as B; B and C are independent; if either B or C occurs, then A cannot occur; at least one of A, B o ...

What statistic was calculated to determine differences

What statistic was calculated to determine differences between the intervention and control groups for the lumbar and femur neck BMDs? Were the groups significantly different for BMDs?

How would i calculate this santa fe black-on-white is a

How would I calculate this: Santa Fe black-on-white is a type of pottery commonly found at archaeological excavations at a certain monument. At one excavation site a sample of 588 potsherds was found, of which 350 were i ...

Over the past 100 years the level of government regulation

Over the past 100 years, the level of government regulation of financial institutions and markets has ebbed and flowed or, as some economists might argue, has ebbed and flooded. Although the laws and regulatory agencies ...

1 the r-squared of a linear regression model is equal to

1) The R-squared of a linear regression model is equal to the proportion of the variance of the target explained by a linear regression model. 2). The R-squared of a linear regression model is equal to the proportion of ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Statistics and Probability Expert