A recent study found that the average life expectancy of a person living in Africa is...
A recent study found that the average life expectancy of a person living in Africa is 53 years with a standard deviation of 7.5 years. If a group of 40 people were selected at random, the probability that their mean life expectancy is less than 55 is?
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A recent study found that the average life expectancy of a
person living in Africa is...
The life expectancy in Africa is 74 with a standard deviation of 8 years. A random...
The life expectancy in Africa is 74 with a standard deviation of 8 years. A random sample of 49 individuals is selected. 1.What is the probability that the sample mean will be between 73.5 and 76 years? 2.What is the probability that the sample mean will be larger than 77 3.What is the probability that the sample mean will be less than 72.7 years?
For questions 1-4 use the following scenario A specific study found the average of doctor visits...
For questions 1-4 use the following scenario A specific study found the average of doctor visits per year for people over 55 is 8 with a standard deviation of 2. Assume that the variable is normally distributed. 1. Identify the population mean 2. Identify the population standard deviation 3. Suppose a random sample of 15 people over 55 is selected. What is the probability that the sample mean is above 9? 4. Suppose a random sample of 10 people over...
6. Insurance companies track life expectancy information to assist in determining the cost of life insurance...
6. Insurance companies track life expectancy information to assist in determining the cost of life insurance policies. They want to know if their clients this year have a longer life expectancy, on average, so the company randomly sampled 20 policyholders to see if the mean life expectancy of policyholders has increased. The mean life expectancy for the random sample was 78.6 years with a sample standard deviation of 5.12 years. The insurance company will only change their premium structure if...
answer neatly and correctly please! According to the historical data, the life expectancy in Belgium is...
answer neatly and correctly
please!
According to the historical data, the life expectancy in Belgium is less than the life expectancy in the United States. A new study has been made to see whether this has changed. Records of 220 individuals from Belgium who died recently are selected at random. The 220 individuals lived a mean of 78.3 years with a standard deviation of 7.1 years. Records of 225 individuals from the United States who died recently are selected at...
7. The average life expectancy of dishwashers produced by a company is 8 years with a standard deviation of 6 month...
7. The average life expectancy of dishwashers produced by a company is 8 years with a standard deviation of 6 months. Assume that the lives of dishwashers are normally distributed. a. What is the probability that a randomly selected dishwasher will have a life expectancy of at least 7 years? b. Dishwashers that fail operating in less than 4 1/2 years will be replaced free of charge. What percent of dishwashers are expected to be replaced free of charge? c....
Recent study stated that if a person chewed gum, the average number of sticks of gum...
Recent study stated that if a person chewed gum, the average number of sticks of gum he or she chewed daily was 8. To test the claim, a researcher selected a random sample of 36 gum chewers and found the mean number of sticks of gum chewed per day was 9. The standard deviation of the population is 1. What would your conclusion be if the p-value of the test is equal to 0.00?
The life expectancy in the United States is 75 with a standard deviation of 7 years....
The life expectancy in the United States is 75 with a standard deviation of 7 years. A random sample of 49 individuals is selected. Round all probabilities to four decimal places. What is the probability that the sample mean will be larger than 77 years? Answer What is the probability that the sample mean will be within 1 year of the population mean? What is the probability that the sample mean will be within 2.5 years of the population mean?
Recent study stated that if a person chewed gum, the average number of sticks of gum...
Recent study stated that if a person chewed gum, the average number of sticks of gum he or she chewed daily was 8. To test the claim, a researcher selected a random sample of 36 gum chewers and found the mean number of sticks of gum chewed per day was 9. The standard deviation of the population is 1. a) Find a 95% confidence interval for the average number of sticks of gum he or she chewed daily b) Explain...
Please answer neatly and correctly! According to the historical data, the life expectancy in the United...
Please answer neatly and correctly!
According to the historical data, the life expectancy in the United States is less than or equal to the life expectancy in Ireland. A new study has been made to see whether this has changed. Records of 290 individuals from the United States who died recently are selected at random. The 290 individuals lived an average of 77.8 years with a standard deviation of 7.8 years. Records of 205 individuals from Ireland who died recently...
A nationwide study on reaction time is conducted on participants in two age groups. The participants...
A nationwide study on reaction time is conducted on participants in two age groups. The participants in Group X are less than 40 years old. Their reaction times are normally distributed with mean 0.489 seconds and standard deviation of 0.07 seconds. a. A person is selected at random from Group X. Find the probability that their reaction time is greater than 0.65 seconds. The participants in Group Y are 40 years or older. Their reaction times are normally distributed b....
6. Insurance companies track life expectancy information to assist in determining the cost of life insurance policies. They want to know if their clients this year have a longer life expectancy, on average, so the company randomly sampled 20 policyholders to see if the mean life expectancy of policyholders has increased. The mean life expectancy for the random sample was 78.6 years with a sample standard deviation of 5.12 years. The insurance company will only change their premium structure if...
answer neatly and correctly
please!
According to the historical data, the life expectancy in Belgium is less than the life expectancy in the United States. A new study has been made to see whether this has changed. Records of 220 individuals from Belgium who died recently are selected at random. The 220 individuals lived a mean of 78.3 years with a standard deviation of 7.1 years. Records of 225 individuals from the United States who died recently are selected at...
7. The average life expectancy of dishwashers produced by a company is 8 years with a standard deviation of 6 months. Assume that the lives of dishwashers are normally distributed. a. What is the probability that a randomly selected dishwasher will have a life expectancy of at least 7 years? b. Dishwashers that fail operating in less than 4 1/2 years will be replaced free of charge. What percent of dishwashers are expected to be replaced free of charge? c....
Please answer neatly and correctly!
According to the historical data, the life expectancy in the United States is less than or equal to the life expectancy in Ireland. A new study has been made to see whether this has changed. Records of 290 individuals from the United States who died recently are selected at random. The 290 individuals lived an average of 77.8 years with a standard deviation of 7.8 years. Records of 205 individuals from Ireland who died recently...
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