We want to use a confidence interval to estimate the proportion of students in the College of Food, Agricultural, and Environmental Sciences that are female.  What sample size would be necessary if we want to estimate the true population proportion of female students correct to within 0.03 with probability 0.95?  In an earlier small-scale pilot study we obtained an estimate of the proportion of female students (p) that was equal to 0.48.

The objects (people, plants, animals, or things) upon which the response variable is measured are called the ____________.

A randomized block design is used to compare postweaning average daily gains of 4 breeds of beef cattle, Hereford, Angus, Charolais, and Simmental (we can think of the breeds at the “treatments”).  The breeds are divided into 3 weight classes (i.e., 3 blocks).  Block 1 contains cattle weighing 450 to 500 lb at the beginning of the experiment, block 2 contains cattle weighing 500 to 550 lb at the beginning of the experiment, and block 3 contains cattle weighing 550 to 600 lb at the beginning of the experiment.  The postweaning average daily gains (in pounds per day) are as follows:  Block Hereford Angus Charolais Simmental 1 3.50 3.60 3.70 3.75 2 3.55 3.63 3.71 3.80 3 3.56 3.62 3.80 3.90 The partially completed ANOVA table for this experiment is as follows: Source df SS MS F Total   .160     Breed   .139 .046 46 Block   .014 .007   Error   .007 .001   Calculate the F statistic for blocks. Do the block means differ (i.e., was blocking effective in removing variation in average daily gain)?  Use a significance level of α = 0.05.

According to the Empirical Rule, we expect ________ % of the observations to fall within two standard deviations of the mean, if the data have a symmetric and mound shaped distribution.

In the 1970’s it was generally assumed that the mean birth weight of Angus beef cattle was 75 lb.  A researcher believes that, due to selection for increased size and growth rate in Angus, the average birth weight is now greater than 75 lb.  He obtains a random sample of n = 144 birth weights of Angus calves and calculates a sample mean of 85 lb and a sample standard deviation of 10 lb. State the null and alternative hypothesis that the researcher wants to test.

The equation for the straight-line probabilistic model is: Y  =  Β0  +  Β1 X +  ε Which one of the following statements regarding this model is correct?

The 25th percentile is also called the

The Australian Journal of Zoology reported on a study of the diets and water requirements of spinifex pigeons.  Sixteen pigeons were captured in the desert and the crop (i.e., stomach) contents of each were examined.  The weight of dry seeds in the crop of each pigeon was measured and recorded.  The mean was 1.5 grams and the standard deviation was 0.22 grams. Find a 90% confidence interval for the average weight of dry seeds in the crops of spinifex pigeons inhabiting the Western Australian desert.

A population of rabbits has a mean weight of 10 lb and a standard deviation of the weights equal to 2 lb.  A rabbit breeder selects 5,000 samples of 64 rabbits each, calculates the mean weight of the rabbits in each of these 5,000 samples, and then graphs the 5,000 sample means. The mean of these 5,000 sample means is expected to be equal to _______.

A numerical descriptive measure of a population is called a ______________.