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TV Time The histogram shows the distribution of selfreported numbers of hours of watching TV per weekend for 60 eighth-grade students. This graph uses a right-hand rule: Someone who watched TV for exactly 4 hours would be in the second bin, the bin to the right of 4.
a. According to the histogram, there are two possible values for the minimum number of hours of watching TV. What are they?
b. How many students watched TV for 18 or 19 hours (more than 17 hours)?
c. How many students watched TV for 7 or fewer hours?
d. What proportion of students watched TV for 6 or fewer hours?
A department store, on average, has daily sales of $28,707.47. The standard deviation of sales is $1000. On Tuesday, the store sold $34,650.77 worth of goods. Find Tuesday's z score. Was Tuesday an unusually good day?
When water taxi sank in the Baltimore Inner Harbor, an investigation revealed that the safe passenger load for water taxi was 3500 lbs. It was also noted that the mean weight of passenger was assumed to be 140 lbs.
The data in the following table come from a time when the United States had a maximum speed limit of 55 miles per hour in all states.
(a) Draw a scatterplot of the raw data and a residual plot. Give interpretations of both.
CD Camera produces a new camera that it claims can take an average of more than 7 photographs per second. A test of 36 randomly selected cameras yielded the following sample values:
1. A researcher believed that there was a difference in the amount of time boys and girls at 7th grade studied by using a two-tailed t test. Which of the following is the null hypothesis?
Determine the mean and standard error of the x - bar distribution.
The management of discount furniture, a chain of discount furniture stores in the northeast, designed an incentive plan for salespeople. To evaluate this innovative plan, 12 Salespeople were selected at random
Of the 389 people over 35 years old, 246 people agreed with the statement. Is there evidence that the percentage of people avoiding fast food is different in the two age groups?
a simple random sample of 50 items from a population with 6 resulted in a sample mean of 32. provide a 90 confidence
Either summarize your design or give an appropriate layout with table.
Find a 95% confidence interval for the mean amount spent by patients at the pharmacy. Show your calculations and/or explain the process used to obtain the interval.
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