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Children in the top 25% are considered accelerated readers as well as qualify for different placements in school. What raw score would mark the cutoff for such placement?
In a random sample of 150 clerical workers, 30 exhibit an intense dislike for their jobs. Compute a 94% confidence interval for the proportion of clerical workers who exhibit an intense dislike for
In the random sample of 150 clerical workers, 30 exhibit an intense dislike for their jobs. Compute a 94% confidence interval for the proportion of clerical workers who exhibit an intense dislike fo
Assume that prices of certain model of new homes are normally distributed with mean of $150,000. Determine the percentage of buyers who paid more than $154,800 if the standard deviation is $2,400
Richard has been given 7-question multiple-choice quiz in his history class. Each question has three answers, of which only one is correct. Since Richard has not attended the class recently, he does
Calculate a 95 confidence interval for the mean life expectancy of a smoker ? Calculate a 95% confidence interval for mean life expectancy of a non smoker. Do these two confidence intervals provide
Keith's Florists has 17 delivery trucks, employed mainly to deliver flowers and flower arrangements in the Greenville, South Carolina, area. Of these 17 trucks, 6 have brake problems.
Does this provide evidence that one class performs at the higher level than the other? Confirm your response with hypothesis test and a 95% confidence interval.
The mean brain volume for a group of healthy adults is collected and the mean brain volume of adults diagnosed with obsessive-compulsive behavior is also obtained. The results are listed below. Test
Given the following information regarding the raise in revenue for top companies x compared to the pay CEO's receive y.
The quality-control inspector of production plant will reject batch of syringes if two or more defective syringes are found in random sample of nine syringes taken from batch. Assume the batch conta
Assume that about 24% of those called will determine an excuse (work, poor health, travel out of town, etc.) to avoid jury duty. If 10 people are called for jury duty, determine the standard deviati
The number of people who enter elevator on the ground floor is a Poisson random variable with mean ten. There are five floors above the ground floor, and each person is equally likely to exit the el
A sample of 25 blue-collar employees at production plant was taken. Each and every employee was asked to assess his own job satisfaction (x) on scale from 1 to 10. In addition, the numbers of days a
From the normal table, the percentages for classes are 2.28%, 13.59%, 34.13%, 34.13%, 13.59%, and 2.28%, respectively. Do observed frequency data provide significant reason to discredit hypothesis t
An intellectual society, HIGHQ, claims that it grants membership only to people whose IQ is at least 2.5 standard deviations above average. Determine the best upper bound that can be attained by Che
The average number of unhealthy days based upon Air Quality Index, AQI, in random sample of 10 metropolitan areas was 33.5 and sample standard deviation was 27.7 days. Determine the 98% confidence i
A corporation administers aptitude test to all new sales representatives. Management is interested in extent to which this test is capable to predict sales representatives' eventual success. The ac
A university dean of students wishes to determine the avearge number of hours students spend doing home work per week. =6.2 hours from a previous study.
Most weather forecasters protect themselves very well by attaching probabilities to their forecasts, such as "The probability of rain today is 40%." Then, if a specific forecast is incorrect, you're
An experiment was conducted to estimate the strength of certain kind of braided cord after weathering. The strengths of 56 pieces of cord that had been weathered for 30 days were investigated.
A baseball player is asked to swing at pitches in sets of four. The player swings at 100 sets of 4 pitches. The probability distribution for making a particular number of hits is given below. Determ
A 1-sample test for a population mean has a critical value of 1.96 and a test statistic of 1.71. The correct statistical conclusion is to:
Assume we have a population of scores with mean (?) of 200 and standard deviation (?) of 10. Suppose that the distribution is normal. Provide answers to the following questions: