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Each student in an experiment was told to look at 100 cars and count the number of people wearing the seat belts. The mean score for the class was found to be 44, and standard deviation =7. Now, a student reported finding 62 seat belt users out of 100. Do you think the student just made up a number rather than actually counting?
A random sample of 121 checking accounts at bank showed an average daily balance of $280 the standard deviation of the population is known to be $6. Find the standard error of the mean.
If someone had x=2 job changes, what does the least squares line predict for y, the annual salary?
At.05 significance level is it reasonable to conclude that it takes longer to determination software issues? Determine the p-value?
Given that the price-to-earnings ratios are uniformly distributed, answer the following questions. What percent of price-to-earnings ratios are between 1.90 and 2.48?
At the 5% level of significance, does this result support the conjecture?
What is the Bonferroni adjustment? What would the Bonferroni adjustment be for a study with four groups for which a researcher decided to use t-tests?
For the following investigative scenarios, state the null hypothesis, and the alternative hypothesis. Also identify the Type 1 and Type 2 errors which can result based on the hypotheses that you defined.
Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test
The statistical research was done primarily through the internet from governmental regulated sources. Estimates were used in consideration of absence of actual information.
Find the probability (type answer as an integer or simplified fraction) of a couple having a baby boy when their fifth child is born, given that the first four children were all boys.
Find all critical points of f (x) and classify them as maximums or minimums. State the intervals where f (x) is increasing and decreasing.
Find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses are made and each question has 3 possible answers.
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