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A college professor randomly selects 25 freshmen to study the mathematical background of the incoming freshman class. The average SAT score of these 25 students is 565 and the standard deviation is estimated to be 40. Using this information, can the professor reject the null hypothesis that the average test score is 550 or less?
Use a 5 % level of significance.
1. Nominal
2. Ordinal
3. Interval
4. Ratio
1. Nominal
2. Ordinal
3. Interval
4. Ratio
The scale of measurement with a true quantitative measurement is the ratio scale because it has the true zero property.
Is this statement true or false?
Class Frequency
5-11 8
12-18 5
19-25 7
26-32 10
33-39 11
40-46 3
Find the mean and standard deviation.
2) A professor of History is teaching a section of 100 students. Her first exam’s grade distribution follows. Calculate the standard deviation for this grouped data.
Exam grades Frequency
45 to < 50 1
50 to < 55 2
55 to < 60 6
60 to < 65 19
65 to < 70 12
70 to < 75 22
75 to < 80 12
80 to < 85 13
85 to < 90 11
90 to < 95 0
95 to < 100 2
The questions and required docs are in the attached files. Do take a look and update me on it.
hours. Create 5 different random samples of 100 bulbs each which has a mean life of x_bar ~
1000 hours and perform one-way ANOVA with state it.
During the nutrition research, the amount of consumed kilocalories per day was measured for 18 people – 10 women and 8 men. Results are as follows:
Women: 1646, 1921, 1990, 1802, 1943, 1606, 1706, 1928, 1645, 1640;
Men: 2287, 2057, 2206, 1978, 2215, 2344, 2081, 2088.
Calculate a 99% confidence interval on the mean for women and men separately. Assume distribution to be normal.
Round your answers to the nearest integer (e.g. 9876).
#339914 on Dec 2023