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1. After receiving some complaints from the readers, your cam¬pus newspaper decides to redesign its front page. Two new formats, Band C, were developed and tested against the current format, A. A total of 75 students were randomly selected and 25 students were randomly assigned to each of three format conditions. The students were asked to evaluate the effectiveness of the format on an 11-point scale (1 = poor, 11 = excellent).
a) State the null hypothesis.
b) What statistical test should you use?
c) What are the degrees of freedom associated with the test statistic?
The sample results are given below. At the 0.10 significance level, test the claim that response and major are independent.
If 20 students in the class said they frequently experience stress in their daily lives, would you be surprised? Explain and use statistics to support your answer
Choose one time-series describing Airlines and make a line chart. Describe the trend (if any) and discuss possible causes. Fit both a linear and an exponential trend to the data.
Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression.
An insurance agent has appointments with four prospective clients tomorrow. From past experience the agent knows that the probability of making a sale on any appointment is 1 out of 5.
Event A occurs with probability 0.2. Event B occurs with probability 0.3. Event C occurs with probability 0.4. If A, B, and C are disjoint, then
Determine and plot the probability mass function and probability distribution function of the contract award amount (in millions of dollars).
Statisticians prefer large samples. Describe briefly the effect of increasing the size of a sample on each of the following: The margin of error of a 95% confidence interval?
Suppose that a random sample of 800 early replacement buyers yields a mean number of dealers visited of 1 = 3.3, and that a random sample of 500 late replacement buyers yields a mean number of dealers visited of 2= 4.5.
Make a decision about buying machinery. The stakeholders in the simulation have different opinions as to the proper course of action the organization should take.
Assume a factory manager wishes to buy machines to perform a certain task in a production process. Certain key parts are produced by these machines.
The following confidence interval is obtained for a population proportion, p:(0.458, 0.490). Use these confidence interval limits to find the point estimate, p-hat.
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