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  3. the area under the curve must add up to one for

The area under the curve must add up to one for a. all density functions. b. just one density...

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Question

Statistics

  1. The area under the curve must add up to one for

    a.

    all density functions.

    b.

    just one density function.

    c.

    no density function.

    d.

    a special group of density functions.

3 points   

QUESTION 2

  1. If the mean of a normal distribution is negative,

    a.

    the variance must also be negative.

    b.

    the standard deviation must also be negative.

    c.

    a mistake has been made in the computations, because the mean ofa normal distribution can not be negative.

    d.

    Standard deviation can be any number but it must bepositive.

3 points   

QUESTION 3

  1. For a normal distribution, a negative value of Z indicates

    a.

    a mistake has been made in computations, because z is alwayspositive.

    b.

    the area corresponding to the z is negative.

    c.

    the z is to the right of the mean.

    d.

    a value that is below the mean.

3 points   

QUESTION 4

  1. The probability density function refers to:

    a.

    probability function for a discrete random variable.

    b.

    probability function for a continuous random variable.

    c.

    probability function for either a discrete or a continuousrandom variable.

    d.

    not enough information

Answer & Explanation Solved by verified expert
3.8 Ratings (734 Votes)
1 To be a probability density function the necessary conditionis that the area under the curve must add up to onea All density functions2 The mean of a normal distribution can be negative    See Answer
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