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Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed the mean age to be 9.2 years. The standard deviation of this sample was 2.8 years. At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students?
a. What is the p-value?
b. What is the critical value of the test statistic?
It is believed that population standard deviation is 15 days. If test is conducted using 0.05 level of significance, what conclusion must be reached?
Researcher asked group of 30 students - 12 of them supported change, 13 of them didn't, and 5 had no opinion. This is not binomial model as?
Country A and Country C spends about the same amount on average per person per year. Which has the greater spread?
Determine the probability that sample mean is between 7.5 and 8 minutes?
A random variable X is normally distributed with mu = 60 and standard XXX = 11. What is zscore for X = 71
What is your conclusion? Are the two variables independent?
To sketch the 3-sigma X-bar chart and R-chart parameters. A candy bar manufacturer desires to set up a variables control chart for the net weight of its candy bars.
If we select one box of cereal at random from this population, what is the probability that it will weigh less than 915 grams?
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Compute the standard error of the proportion.
each person received was determined by randomization. For each person who was sent one of the surveys, the researcher recorded whether or not a completed survey was returned.
Determine the mean and standard deviation of this distribution?
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
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