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The fundraising officer for a charity organization wants to estimate the average donation from contributors to the charity. Prior data indicate that the standard deviation of charitable contributions to the organization is approximately $95. What size sample is necessary if the fundraising officer wants to estimate the true average donation from all contributors to the charity within $20 with 95% confidence?
Who tweets? Do younger people use Twitter more often than older people? In a random sample of 316 adult Internet users aged 18 to 29, 26% used Twitter.
Express each of the following relationships in terms of probabilities or conditional probabilities relating to the population of animals.
James Burke claims that about 70% of all single men would welcome a women taking the initiative in asking for a date. A random sample of 20 single men were asked if they would welcome a women taking the initiative in asking for a date.
A box contains 10 disks of radii 1, Z ..., 10, respectively. What is the expected value of the circumference of a disk selected at random from this box?
When we speak, we convey not only information but emotional tone as well. Ambady et al. (2002) investigated the relationship between the emotional tone used.
Calculate chi-square for the cross-tab. Show your work. Is there a statistically significant relationship between these variables?
one sample has n 8 and ss 21 and a second sample has n 8 and ss 35. what is the pooled variance for the two
Set up the null and alternative hypotheses for testing these claims. In order to conduct the test, the customer selected a significance level of alpha=.05. Interpret this value. (I.e. what does it mean to conduct the test at a level of alpha=.05)
a sample of 100 customers at the lighthouse cafe resulted in the following frequency distribution for a dinner
Discuss the issue of statistical power in non-parametric tests (as compared to their parametric counterparts). Which type tends to be more powerful? Why?
Conduct a hypothesis test to verify if the claim that a bottle contains less than sixteen (16) ounces is supported. Clearly state the logic of your test, the calculations, and the conclusion of your test.
Based on this information, what is the probability that a customer will spend more than 9 minutes in the record store?
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