Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. This method is designed to increase the likelihood that each baby will...

In 1980 more than 35% of cars purchased had a manual transmission  (i.e. stick shift). By 2007 the proportion had decreased to 7.7% . A random sample of college students who owned cars revealed...

please solve the equation out step by step

speed of automobiles on a certain stretch of freeway at 11:00 PM are normally distributed with mean 65 mph. Twenty percent of the cars traveling at speeds between 55 and 65. What percentage of the...

This is from set of questions from elementary statistical methods.

The claim is that the proportion of peas with yellow pods is equal to 0.25. The sample statistics from one expirement include 580 peas with 167 of them having yellow pods. Find the value of the test...

A \$100,000 life insurance policy costs \$600 for one year. If the probability that persons in the population from which the policy owner comes, lives for 1 year is .9985, do the calculations. What...

data from 2010 suggests that 19% of all us adults smoke, and 14% of all us adults are males who smoke. if 48.4% of the adults in the us are make and we randomly select a us adult,determine the following...

a researcher claims that the standard deviation of the number of deaths annually from tornados in the US is less than 35. If a random sample of 11 years had a standard deviation of 32, is the claim...

number of sales: 6     7     8     9   probability:       0.4    0.3  0.15    0.15

it has been reported that a standard deviation of the speeds drivers on the Interstate 75 near Findlay, OH, is 8 miles per hour for all vehicles. a driver from experience that this is very low. a...

Listed below are the playing times (in seconds) of songs that were popular at the time of this writing. Find the (a) mean, (b)median, (c) mode, and (d) midrange for the given sample data. Is there...