Test
C731 Unit 4
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Preguntas del test (20)
1A grocery store is interested in how much money, on average, their customers spend each visit in the produce department. Using their store records, they draw a sample of 1,000 visits and calculate each customer’s average spending on produce.
What kind of data is “amount of money spent on produce per visit”?- Aquantitative-discrete
- Bquantitative-continuous
- Cqualitative
2A grocery store is interested in how much money, on average, their customers spend each visit in the produce department. Using their store records, they draw a sample of 1,000 visits and calculate each customer’s average spending on produce.
The study finds that the mean amount spent on produce per visit by the customers in the sample is ?12.84. This is an example of a:- Apopulation
- Bsample
- Cparameter
- Dstatistic
- Evariable
3A health club is interested in knowing how many times a typical member uses the club in a week. They decide to ask every tenth customer on a specified day to complete a short survey including information about how many times they have visited the club in the past week.
What kind of a sampling design is this?- Acluster
- Bstratified
- Csimple random
- Dsystematic
4A health club is interested in knowing how many times a typical member uses the club in a week. They decide to ask every tenth customer on a specified day to complete a short survey including information about how many times they have visited the club in the past week.
“Number of visits per week” is what kind of data?- Aqualitative
- Bquantitative-continuous
- Cquantitative-discrete
5The U.S. federal government conducts a survey of high school seniors concerning their plans for future education and employment. One question asks whether they are planning to attend a four-year college or university in the following year. Fifty percent answer yes to this question; that fifty percent is a:
- Aparameter
- Bstatistic
- Cvariable
- Ddata
6Imagine that the U.S. federal government had the means to survey all high school seniors in the U.S. concerning their plans for future education and employment, and found that 50 percent were planning to attend a 4-year college or university in the following year. This 50 percent is an example of a:
- Aparameter
- Bstatistic
- Cvariable
- Ddata
7The manager of a department store decides to measure employee satisfaction by selecting four departments at random, and conducting interviews with all the employees in those four departments. What type of survey design is this?
- Acluster
- Bstratified
- Csimple random
- Dsystematic
8In a left-skewed distribution, which is greater?
- Athe mean
- Bthe media
- Cthe mode
9In a right-skewed distribution, which is greater?
- Athe mean
- Bthe median
- Cthe mode
10You are given a cube of pure copper. You measure the sides of the cube to find the volume and weigh it to find its mass. When you calculate the density using your measurements, you get 8.78 grams/cm3. Coppers accepted density is 8.96 g/cm3. What is your percent error?
- A1%
- B.02%
- C.01%
- D2%
11Robert conducted an experiment in which he investigated how much water a paper towel could absorb. Initially, Robert found that one paper towel can absorb 12.8g of water. Later he found that his scale was not calibrated, so he had to repeat the experiment. After repeating the experiment with a new scale, Robert found that one paper towel can actually absorb 32.9g of water. What is the approximate percent error between the findings of the first and second experiments?
- A72%
- B157%
- C61%
- D20%
- E39%
12A reaction between one mole of sodium and one mole of chloride should yield 42 grams of sodium chloride. In your experiment, the actual yield is 32.73 grams. Calculate the percent error of your experiment.
- A15.42%
- B24.07%
- C22.07%
- D25.13%
13After conducting an experiment that involved the reaction of solutions of Na2SO4 and Ba(NO3)2, 6.8 grams of BaSO4 was yielded. What is the percent error if the theoretical yield of BaSO4 for this experiment is 7.8 grams?
- A12.8%
- B9.2%
- C14.7%
- D13.2%
14A student measures that a piece of string is 2.6 cm, but the actual length of the string is 2.9 cm. What is the student's percent error?
- A20.6%
- B38.5%
- C10.3%
- D19.7%
15A standard mass of 100.0 grams was placed on a balance. The balance indicated that the mass was 101.6 grams. What is the percent error for the balance?
- A3.2%
- B4.7%
- C2.9%
- D1.6%
16From an experiment, a student found the density of a rubber eraser was 3.3gcm3. However, the actual density of the eraser is 2.9gcm3. What is the student's percent error?
- A13.8%
- B12.2%
- C15.9%
- D11.7%
17The experimental value obtained for the specific heat of gold was 0.33JgoC. The known specific heat of gold is 0.219JgoC. What is the percent error?
- A50.7%
- B33.6%
- C40.2%
- D47.3%
18A reaction produced 98.5 grams of nitrogen dioxide gas. However, the calculated theoretical value indicates that 115.2 grams of nitrogen dioxide gas should have been produced. What is the percent error?
- A10.1%
- B24.9%
- C14.5%
- D16.3%
19A student found out through experimentation that it requires 23.6 mL of a NaOH solution to completely neutralize 25 mL of a HCl solution. However, the actual amount of NaOH solution needed to neutralize 25 mL of the HCl solution is 22.8 mL. What is the percent error?
- A8.2%
- B3.5%
- C4.9%
- D1.6%
20Joseph calculated that the concentration of an acid solution was 13.2M. The actual concentration of the solution was 16.3M. What is Joseph's percent error?
- A22.9%
- B19.0%
- C16.3%
- D3.3%
Información
- Descripción
- Test sobre C731 Unit 4, creado por eli corniel el 04/10/2021.
- Autor
- eli corniel
- Idioma
- English
- Visitas
- 0
- Historial
- Creado el 4 oct 2021 · actualizado el 4 oct 2021
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