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A bottling company uses a filling machine to fill plastic bottles with water. The bottles are supposed to contain 300 milliliters (ml). In fact, the contents vary according to the normal distribution with N( = 298, ! = 3). What is the probability that an individual bottle contains less than 295ml? Make sure to standardize (z) using the standard deviation for the sampling distribution. Let"s consider the very large database of individual incomes from the Bureau of Labor Statistics as our population. It is strongly right skewed. How large a sample size?
Using the 0.10 level of significance, is there evidence that the mean shopping time at the local supermarket is greater than the claimed value of 22 minutes?
Find the probability of getting all girls. Find the probability of getting at least one child of each sex. Find the probability of getting exactly two children of each sex.
Determine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval?
Develop a regression model for predicting the difference in the asking price and selling price.
Find the percentage of such males that weigh between 190 and 210 lb. (Note: Make sure you choose the flag value closest to 190 and 210.) Give the proportion as a decimal rounded to thousandths.
The following data was randomly drawn from a normal population. At an alpha level of .05, does the mean of the population differ significantly from -150. Use Excel.
Finding the probability selecting a defective item from a collection of items using tree diagram
Ten people agree to take part in an experiment designed to determine whether a persons weight differs between morning & evening.
$600 (1 chance in 4800); $200 (1 chance in 2500). Find the expected value of the amount won for one entry if the cost of entering is 52 cents.
Estimate a range of values centered about the mean in which about 95% of the state per captia income taxes will fall.
A random sample of 56 people measured accuracy w/ positive errors representing watches that are ahead of the correct time and negative rep. those behind the time.
You have been research for your statistics class on how nervous the American adults are in general, you have decided to use HINTS 2007 data set that has a scale (going from 0 to 24)measuring the psychological distress of the respondents.
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