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Normal distribution, standard deviation and mean

True or false: When the variable is normally distributed, the sample size is less than 30, and the population standard deviation is known, then the t distribution must be used to find confidence intervals for the mean.

Subject:

Statistics

Topic:

All Topics

Posting ID:

6302

OTA ID:

103506

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Working with normal distribution and probability

The average hourly wage of workers in a fast food restaurant is $5.85 with a standard deviation of $0.35. Assume that the distribution is normal. If a worker at this fast food restaurant is selected at random, what is the probability that the worker earns more than $6.25 an hour?

Subject:

Statistics

Topic:

All Topics

Posting ID:

6303

OTA ID:

102156

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Normal Distribution

In a production run of 40 of a particular model of radiation detector, there are four which have defective circuits. If a sample of three of these is chosen without replacement, what is the probability that all three will be defective?

Subject:

Statistics

Topic:

All Topics

Posting ID:

6304

OTA ID:

103447

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Normal distribution and percentiles

True or false: It is not possible for the score in a distribution, not necessarily normal, which ranks as the 90th percentile to also be the mode for the distribution.

Subject:

Statistics

Topic:

All Topics

Posting ID:

6305

OTA ID:

101733

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Statistics: Multiple Choice Questions

Multiple choice statistics questions on Chebyshev's theorem, standard deviation, coefficient of variation, relative dispersion, Pearson's coefficient of skewness, and sample variance. See attached file for full problem description.

Subject:

Statistics

Topic:

All Topics

Posting ID:

6317

OTA ID:

103234

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