the shape of the sampling distribution of x bar

What formula is used to gain information about a sample mean when the variable is normally distributed or when the sample size is 30 or more? => z = X - μ σ or z = X ‾ - μ σ n or z = X &OverBar..

What is the standard deviation (σ x ‾ ) of the sampling distribution for a sample of 6, when the standard deviation of the target population is 21? => 1.31 or 3.5 or 0.29 or 8.57..

If X = 1 represents a coin landing heads-up, and X = 0 represents a coin landing a coin landing tails-up, then find the sampling distribution of the mean( x ‾ ) for 2 tosses of a fair coin. => Figure 2 or Figure 1 or Figure 3 or Fi..

Random Variable and Probability Distribution - If is often very important to allocate a numerical value to an outcome of a random experiment. For example consider an experiment of tossing a coin twice and note the number of heads (x) obtained. Outcome : HH HT TH TT No. of heads ..

If is often very important to allocate a numerical value to an outcome of a random experiment. For example consider an experiment of tossing a coin twice and note the number of heads (x) obtained. Outcome : HH HT TH TT No. of heads (x) : 2 1 1 0 x is called a random va..

Let S be a sample space associated with a given random experiment. A real valued function X which assigns to each w i S, a unique real number, X( w i ) = x i is called a random variable . Two types of random variables are 1. Continuous r..

As the sample size n increases without limit, the shape of the distribution of the sample means taken with replacement from a population with mean μ and standard deviation σ will approach a normal distribution. This distribution w..

Introduction - The scientific methods of collection of data, its classification and application to commerce and everyday life is called statistics. A list of some important terms as follows: (i) ungrouped data (ii) tabulation of data (iii) range (iv) frequency (v) frequency distribution (..

A curve is normally distributed with x ‾ = 30.6 and σ = 5.2 , find the area under the curve between 26.4 and 36.8 . => 0.2881 or 0.6730 or 0.3849 or 0.0968..

In a statistical hypothesis testing, the standard deviation of the population is 8, H 0 : μ ≤ 100 and H 1 : μ > 100. Which of the following is true for the sample mean ( X ‾ ) to reject the null hypothesis(H 0 ) at α = 0.01 for a sample..