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Calculating mean, median, variance and standard deviation from a sample population.

In a recent survey of small bakeries in the Southeast, 10 bakeries report the following number of employees: 15, 14, 12, 19, 13, 14, 15, 18, 13, 19. Find the mean, median, variance and standard deviation.

Subject:

Statistics

Topic:

All Topics

Posting ID:

3365

OTA ID:

102799

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Trials and probability

1. What is the probability that it rained on a particular day, given that it rained on the previous day? 2. What is the probability that it rained on a particular day , given that it did not rain on the previous day? 1. Collect the data, citing your source and time span you used 2. Find p-hat(R), the proportion of days on which it rained given that it rained the pervious day. 3. Find p-hat (NR) the proportion of days on which it rained given that it did not rain the previous day. 4. Construct confidence intervals for both p-hat(R) and P-Hat(NR) (you can chose level of confidence) 5. Draw a conclusion as to whether rain on consecutive days is an independent phenomenon. State your... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

3391

OTA ID:

103139

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Determining the probability using binomial distribution.

The Bell telephone co. surveyed an apartment building with 500 units to find out who subscribes to their service. Turns out 70% of the units use Bell's service. Find the probability that less than 340 units are using Bell services so we are looking for: P(X<340) Z= 340-350/10.25=-0.98

Subject:

Statistics

Topic:

All Topics

Posting ID:

3397

OTA ID:

101733

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Family incomes in two particular neighborhoods follow a normal distribution.

QUESTION: Example: Family incomes in two particular neighborhoods follow a normal distribution. For Neighborhood 1 the mean is $26,500, with a standard deviation of $15,000. For Neighborhood 2, the mean is $30,000 with a standard deviation of $18,000. A) What proportion of families in Neighborhood 1 have incomes below the mean family income in Neighborhood 2? B) What income level in Neighborhood 1 represents the top 10% for that neighborhood? C) What income level for neighborhood 2 represents the lowest 5% of incomes for that neighborhoods? D) For neighborhood 1, what percentage of families have incomes that fall between the mean incomes of Neighborhood 1 and neighborhood ... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

3404

OTA ID:

103058

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Understanding and calculating probability distribution.

A researcher is studying IQ levels. From past experience she knows the population mean IQ for adults is 110 and the standard deviation is 15. a) If samples of 30 IQs are selected and the sample mean is calculated for each sample, what can be said about the sampling distribution of the sample means, and why? b) If she takes a sample of 30 adults and measures their IQs , what is the probability that the sample mean will be within 10 points of the possible mean. c) What is the probability that the sample mean will actually be less than the population mean by more than 5 points?

Subject:

Statistics

Topic:

All Topics

Posting ID:

3405

OTA ID:

103058

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