Answer:
In studies about new medicines, researchers usually give one group of patients the medicine that is designed to treat an illness. They give another group of patients a placebo, which is taken the same way as the medicine but does not actually contain the ingredients of any medicine. Different medicines are tested in different experiments, but the placebos usually contain the same non-medical ingredients. If both groups of patients are healed, then researchers cannot be sure whether the medicine caused improvement, but if the group given the medicine is healed while the group given the placebo remains ill, researchers can conclude that the medicine causes the illness to go away.
In medical experiments, which group receives placebos?
the experimental group
the control group
both the experimental and control groups
neither the experimental nor control group
Explanation:
The different types<span> of </span>databases<span> include operational </span>databases<span>, end-user </span>databases<span>, distributed </span>databases<span>, analytical </span>databases<span>, relational </span>databases<span>, hierarchical </span>databases<span> and </span>database<span> models.
Source Bing</span>
<span>UHF and HF technology enables afloat forces to communicate more securely and to operate in a more dispersed manner.
</span>UHF stands for Ultra High Frequency, while HF stands for <span>High Frequency .
</span>The UHF range of the radio spectrum is the band<span> extending from 300</span>MHz<span> to 3 GHz and </span>is extensively used for satellite<span>communication and broadcasting, in </span>cellular telephone<span> and paging systems, and by third-generation (</span>3G<span>) </span>wireless services.
Basically no boot device could be 1 of three things listed below.
1. You have connected an incorrect external device and the system responds to boot from this however no operating system is available. Hence the error. What to do : You have disconnect, reset and select the correct bootable device.
2. You have a faulty hardware specifically your bootable harddisk, corrupted or malfunctioning. You have to reformat and correct the bios installed on the disk.
3. You have not selected correct bootable device. - Select the correct harddisk, if you have partition, be sure to select the one with the Operating system is installed to.
