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A building has many birds it has 25 different species each are equally likely to be seen. While walking through the building you see eight birds what is the probability that on your walk you have se
Based upon the sample, make a point estimate of population mean anxiety score for today's children. Make an 80% confidence interval estimate of today's population mean.
If the sample has n = 36 scores, calculate a 90% confidence interval to estimate the unknown population mean.
Is this result sufficient to conclude that there is a significant difference in the ratings for self versus others? Use a two-tailed test with ? = .05. Compute r2 and estimate Cohen's d to measure t
Do the data point out a significant change in problem-solving capability? Employ a two-tailed test with ? = .05. Calculate an estimated Cohen's d to measure the size of the effect.
Which of following research conditions would be appropriate for estimation instead of hypothesis test?
Point estimates and interval estimates offer the same degree of precision.
In general, an raise in variance for the sample of difference scores will cause ______.
A researcher uses a repeated-measures study to compare two treatment conditions with a set of 20 scores in each treatment. What would be the value of df for the repeated-measures t statistic?
On bird watching outing one weekend, you intend to persist till you've seen 8 birds clearly enough to determine which species they belong to. Determine the probability that, on your outing, you will
A machine is designed to fill jars with 16 ounces of coffee. A consumer suspects that machine isn't filling the jars completely. A sample of 8 jars has mean of 15.6 ounces and standard deviation of
For one of the production lines, the mean diameter is set at the 20.00 mm(millimeters). The standard deviation, over long period of time, was calculated to be 0.150 mm. What percent of ball bearings
If the sample of nine units is randomly chosen from a normal population and sample mean is determined to be 54 and the sample standard deviation is 12. Determine the value of the test statistic if
The table below gives grade point average at the end of two years of pre-medical curriculum and scores on a national medical exam for 10 med students. What is the slope of the regression student GPA
A manufacturing procedure produces metal disks. The process is monitored by taking samples of eight disks every hour and measuring the diameter of the disks. Based upon the following run data (mean
The scores upon a final exam are normally distributes with the mean grade of 79 and standard deviation of 9.5. The top 10% of the students will receive an A on this exam. Determine the minimum numer
The amount in each package varies a little bit, following a normal distribution with a standard deviation = 0.9 kg. A consumer group measures the weight of 36 bags of rice selected randomly from the
For each of following situations, point out how you may employ ratio or regression estimation to: Determine the average weekly amount spent on food by households in Alain
For each of the following situations, indicate how you might use ratio or regression estimation. Estimate the total yield in bushels of a 5000-acre field.
The Admissions Department from prestigious University is using the data below (which was randomly chosen from large pool of current graduates of that University) to entice prospective students to en
A student scored 84 points upon test where the mean score was 79 and standard deviation was 4. Determine the student's z score, rounded to 2 decimal places, and place it in the blank.
An advertisement for car states that it is 10% more powerful than its competitor. This is an example of
The amount of time required to run the Boston marathon is an example of which type of variable?
Which of the following correctly explains the relationship between a sample and a population?
The distribution of income for employees at the firm has mean of 41,000 and standard deviation of 5000. a) Determine the approximate distribution for the mean in a random sample of 100.