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6) A medical researcher wants to investigate the amount of time it takes for patients' headache...
A medical researcher wants to investigate the amount of time it takes for patients' headache pain...
A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 19 minutes. How large a sample should she take to estimate the mean time to within 5 minutes with 92% confidence? Sample size=
(1 point) A medical researcher wants to investigate the amount of time it takes for patients'...
(1 point) A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 25 minutes. How large a sample should she take to estimate the mean time to within 2 minutes with 94% confidence? Sample Size =
w pay OLUU for the upgrade. 6(15%) A researcher worker wants to determine the average time...
w pay OLUU for the upgrade. 6(15%) A researcher worker wants to determine the average time it takes a mechanic to rotate the tires of a car and she wants to be able to assert with a 95% confidence that the mean of her sample is off by at most 0.50 minutes. It is known that o = 1.6 minutes and the time of rotation is normally distributed. How large a sample size will she have to take? Frequently used...
Suppose the amount of time a doctor spends with their patients is normally distributed with a...
Suppose the amount of time a doctor spends with their patients is normally distributed with a mean of 17.4 minutes and with standard deviation of 3.8 minutes. Suppose 26 patients have scheduled appointments on one day. What is the probability that the mean amount of time for those 26 patients is less than 18.5 minutes, which would be equivalent to the doctor seeing patients for 8 hours and 1 minute that day.
A medical researcher wants to examine the relationship of the blood pressure of patients before and...
A medical researcher wants to examine the relationship of the blood pressure of patients before and after a procedure. She takes a sample of people and measures their blood pressure before undergoing the procedure. Afterwards, she takes the same sample of people and measures their blood pressure again. The researcher wants to test if the blood pressure measurements after the procedure are less than the blood pressure measurements before the procedure. The hypotheses are as follows: Null Hypothesis: μD ≥...
A medical researcher wants to examine the relationship of the blood pressure of patients before and...
A medical researcher wants to examine the relationship of the blood pressure of patients before and after a procedure. She takes a sample of people and measures their blood pressure before undergoing the procedure. Afterwards, she takes the same sample of people and measures their blood pressure again. The researcher wants to test if the blood pressure measurements after the procedure are greater than the blood pressure measurements before the procedure. The hypotheses are as follows: Null Hypothesis: μD ≤...
A medical researcher wants to examine the relationship of the blood pressure of patients before and...
A medical researcher wants to examine the relationship of the blood pressure of patients before and after a procedure. She takes a sample of people and measures their blood pressure before undergoing the procedure. Afterwards, she takes the same sample of people and measures their blood pressure again. The researcher wants to test if the blood pressure measurements after the procedure are different from the blood pressure measurements before the procedure. The hypotheses are as follows: Null Hypothesis: μD =...
Annie is a researcher who wants to find a confidence interval estimate of the mean time...
Annie is a researcher who wants to find a confidence interval estimate of the mean time it takes to complete an order over the phone at a call center for a large retail company. She has selected a random sample of 18 orders and recorded the time to complete the order. The sample mean time was 4.27 minutes and the sample standard deviation was 0.78 minutes. Assuming the conditions needed for inference are met,which of the following is the appropriate...
a researcher wants to determine the average time it takes to achieve 100% signal strength of...
a researcher wants to determine the average time it takes to achieve 100% signal strength of a pressure sensor. He plans to measure a sample with 95% confidence that the mean of his sample is off by at most 0.75 min. If he presumes from pressure sensor manufacturer that μ=1.6min, how large a sample will he have to take
Suppose a researcher wants to learn more about the mean attention span of individuals in some...
Suppose a researcher wants to learn more about the mean attention span of individuals in some hypothetical population. The researcher cites that the attention span (the time in minutes attending to some task) in this population is normally distributed with the following characteristics: 20+_36. Based on the parameters given in this example, answer the following questions: a. What is the population mean (μ)? b. What is the population variance? c. Sketch the distribution of this population. Make sure you draw...
(1 point) A medical researcher wants to investigate the amount of time it takes for patients' headache pain to be relieved after taking a new prescription painkiller. She plans to use statistical methods to estimate the mean of the population of relief times. She believes that the population is normally distributed with a standard deviation of 25 minutes. How large a sample should she take to estimate the mean time to within 2 minutes with 94% confidence? Sample Size =
w pay OLUU for the upgrade. 6(15%) A researcher worker wants to determine the average time it takes a mechanic to rotate the tires of a car and she wants to be able to assert with a 95% confidence that the mean of her sample is off by at most 0.50 minutes. It is known that o = 1.6 minutes and the time of rotation is normally distributed. How large a sample size will she have to take? Frequently used...
Annie is a researcher who wants to find a confidence interval estimate of the mean time it takes to complete an order over the phone at a call center for a large retail company. She has selected a random sample of 18 orders and recorded the time to complete the order. The sample mean time was 4.27 minutes and the sample standard deviation was 0.78 minutes. Assuming the conditions needed for inference are met,which of the following is the appropriate...
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Amplitude=3;
fs=8000;
n=0:399;
t=0:1/fs: n*1/fs-1/fs;
signal=3+3*cos(2*pi*1100*t)+3*cos(2*pi*2200*t)+3*cos(2*pi*3300*t);
fftSignal= fft(signal);
fftSignal=f ftshift (fftSignal);
f=fs/2*linspace(-1,1,fs);
plot(f,abs(fftsignal);
xlabel('Frequency(Hz)’)
yla
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