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i. In an experiment, people are told to solve a problem by focusing on the details. Is the speed of solving the problem different for people who get such instructions compared to the speed for people who are given no special instructions?
ii. Based on anthropological reports in which the status of women is scored on a 10-point scale, the mean and standard deviation across many cultures are known.A new culture is found in which there is an unusual family arrangement. The status of women is also rated in this culture. Do cultures with the unusual family arrangement provide higher status to women than cultures in general?
iii. Do people who live in big cities develop more stress-related conditions than people in general?
Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
We have no idea Regarding the shape of the population distribution. What is the probability that the mean fee for a sample of 30 customers was less than $125?
The information that the distribution of the serve speeds was bell shaped. What proportion of the player's serves are expected to be between 107 mph and 118 mph?
A Myrtle Beach resort hotel has 120 rooms. In the spring months, hotel room occupancy is approximately 75%. What is the probability that at least half of the rooms are occupied on a given day?
What is the maximum error of estimate for p ?
The probability that Pete will catch fish when he goes fishing is .8. Pete is going to fish three days next week. Define the random variable x to be the number of day Pete catches fish. (hint. binomial distribution)
Suppose you take a random sample of 15 bearings and compute xbar = 8.2535. What is the probability that you will see a sample mean greater than xbar?
What is the probability that the mean breaking strength of the 3 untreated specimens is at least 25 pounds greater than the mean strength of the 3 treated specimens?
The number of shark attacks per year in the US is distributed approximately normal, with a Variance of 31.8 and a standard deviation of 10.
Find the value of Proportion and construct a 90% confidence interval for proportion.
There are 40 English students enrolled. The teacher questioned 5 students who always sit in the back of the classroom. Three of the 5 said "yes" when asked if they would like "A Tale of Two Cities" as the next class reading assignment.
The bank wants to find out the waiting time of their customers during the Friday evening hours from 5pm to 8pm. Using the data in ungrouped form, compute the Standard Deviation, using the computational formula.
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
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