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It is proposed that the new design be implemented only if sample data strongly indicates a reduction in true average braking for the new design. A sampe of 36 observations of the new design resulted
Assume that the hay fever rate in each age group has an approximately normal distribution. Does the data indicate that the age group over 50 has a lower rate of hay fever? alpha is 0.05. Show formul
In an effort to improve the vocabulary of 10 students, a teacher provides a weekly 1-hour tutoring session for them. A pre-test is given before the sessions and a post-test is given afterwards.
Test at the 5% level of significance to determine if this rate is higher than the 15% quoted in a recent Environmetrics article on the average proportion of damaged trees in the Northeast.
Test the claim (at the 1% level of significance) that the smoking rate for fine arts students is less than the national average. State the null and alternate hypothesis using correct symbolization.
What is Madeleine's alternative hypothesis? What is the Null Hypothesis?
Western Pennsylvania has an average CO2 emission rate of 1,538 lb/MWh. The city of Pittsburgh has 335,000 residents. If we assume that each resident uses 12,000 kWh/y of electricity, determine the a
Reginald brown an inspector from the department of weights and measures, weights 15 eighteen ounce cereal boxes of corn flakes. He finds their mean weight to be 17.78 ounces with a standard deviatio
How big is the minimum required sample size that would allow you to meet your confidence and precision goals? If you wanted your precision to double (that is, your precision would be plus or minus on
For each of the situations described, state whether the sampling procedure is simple random sampling, stratified random sampling, cluster sampling, systematic sampling, or convenience sampling.
The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months. x 0 1 2 3 4 5 P (X=x) 0.20 0.25 0.20 0
A four-year university has decided to implement a new approach to teaching Statistics. Full-time and adjunct professors were surveyed to determine whether they preferred the traditional lecture appr
Let X be a discrete random variable with possible values x = ?1,0,1,2 and probability function f(x) = kx3 + 0.15 for x = ?1,0,1,2.
The pizza shop wanted to determine what proportion of its customers ordered only cheese pizza. out of the 80 customers surveyed, 15 ordered cheese pizza. what is the 99% confidence interval of the t
The birth weights for twins are normally distributed with a mean of 2353 grams and a standard deviation of 647 grams. Use z-scores to determine which birth weight could be considered unusual.
Let X be a discrete random variable with possible values x = -1,0,1,2 and probability function f(x) = kx3 + 0.15 for x = -1,0,1,2.
A researcher investigated the effect of volume of background noise on participants' accuracy rates while performing a difficult task. He tested three groups of randomly selected students and obtaine
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall.
Determine the error for each of the following forecasts. Compute MAD and MSE. Period Value Forecast Error 1 202 - - 2 191 202 3 173 192 4 169 181 5 171 174 6 175 172 7 182 174 8 196 179 9 204 189 10
You toss a coin five times. Each time it lands on heads, you double your money. Each time it lands on tails you lose half of your money. You start with two dollars. What is the expected amount that
What percentage of these students drink coffee or smoke cigarettes? What percentage of these students drink coffee but smoke cigarettes? What percentage of these students neither drink coffee nor smok
The federal government decides to screen the entire population for the disease and then administer the treatment. Will people be more likely or less likely to get bright green skin if such a policy
Of all college degrees in the United States, 50% are bachelor's degrees, 59% are degrees earned by women and 29% are bachelor's degrees earned by women. What percent of all degrees are earned by men
Regardless of your answer in part a, carry out an appropriate nonparametric test to determine whether the mean thickness is greater than 41.Use = .05.